This is my mini review of the tablet.
Most displays have colorful uneven speckles in them, and usually the quality of the display depends on how small these speckles are, and it also depends on how close your face is to the display. My usual distance to a tablet display is about 14 inches, and at that distance I can see the speckles on this display. The 3D viewing distance though is about 24 inches, and at that distance I can't see the speckles. I've had/used laptops and tablet PCs in the past that have had really bad speckles, I would say this one is not as bad but still not as good as some other android tablets I've used.
The backlight also reminds me of a laptops backlight, where the horizontal (long) directions of the display has more consistent lighting, while the vertical (short) angles have a sharp fall off in one directly while becoming really bright in another. This kind of makes the display lighting uneven when holding it in portrait mode, but works fine in landscape.
The display is also reflective so it is best to watch movies in a dark room.
I also have a 3DS and a LG Optimus 3D, and I have to say all these auto-stereoscopic displays kind of suck. They are not terrible but content makes a huge difference in how much ghosting you see (I haven't had problems with ghosting in shutter glasses for a decade now). The 3DS seems to me to be the best of them, but even it will have a lot of ghosting with high contrast content, plus it is hard to get content on it to compare and it has the smallest screen. The LG Optimus 3D was bad because the idea spots for the left and right eyes had different vertical positions, so you either tilt your head or just try to ignore the ghosting. The Gadmei tablet has color shifting when phasing between left/right images, this actually helps in some ways because your eyes will either ignore the discolored ghosting or it wont bother you as much. But with that said, in some cases I found it difficult to find the sweet spots that had no ghosting, and also it seems that rather than just contrast being the source of ghosting, it seems that now it is more about color contrast (red and blue) that cause ghosting artifacts the most.
I used a (high contrast) Tron Legacy trailer as a test and the Gadmei tablet handled it better then the LG in terms of ghosting. But then I tried several images of screen shots from 3D games and I found a lot of discolored ghosting and high difficulty in finding the least annoying spot to view from.
I also tried several other 3D videos and it seems the Gadmei display for some reason handles 3D in videos very well in comparison to looking at 3D pictures. This could be due to the lack of separation control in their 3D video player, and also because with the pictures I had a lot of separation because of my settings in the games they were taken from. The Optimus 3D display on the other hand needs the separation control more because it is such a small display and movies have very little depth in them and the extra separation probably had made the ghosting look worse on the optimus 3D.
I feel like in the future I would want a passive 3D display (not the red/blue stuff) for a tablet (and other devices). The auto-stereoscopic 3D displays are limited. Although I do think the Gadmei tablet is good enough for watching 3D movies.
You do also kind of have 3 positions that can be used to view 3D movies, although I'm not sure how comfortable it would be for 3 people to sit next to each other that close, 2 people should be able to watch just fine in the off center positions.
If you are someone who wants high quality perfect 3D you will be disappointed by this tablets display, especially if you have ever used a 3DS or Optimus 3D and didn't like those displays.
I tried 5 external USB drives, 3 worked and 2 didn't.
Generic 2GB USB flash stick drive worked (FAT32).
Edge Disk Go, 320GB USB hard drive worked (FAT32).
IO Mega, 512GB USB hard drive worked (FAT32).
WD, 2TB USB hard drive wasn't working (FAT32), but I always have trouble with this drive because FAT32 doesn't really support large hard drives well, and windows 7 is slow with working with the drive.
WD, 2TB USB hard drive wasn't working (NTFS), I didn't really expect it to support NTFS since I don't believe it is an open standard.
I tried 3 keyboards and a mouse.
My mini keyboard didn't work, it could be a power issue since the LEDs on it were flickering a little.
I have an old ergonomic Microsoft Keyboard that worked perfectly.
My other keyboard is a logitech gaming keyboard that also has a USB hub built in, it didn't work but I wouldn't imagine it working.
My logitech MX518 mouse worked (a mouse cursor appears when plugged in).
HDMI output works, but it looks like it is running the same resolution as the device itself and is simply scaling it up.
When HDMI is connected a notification appears, and when you tap on it, it brings up a dialog that lets you select output to the tablet or HDMI 720p or 1080p. In HDMI mode the tablet display turns off, a mouse cursor is shown on the TV, and the tablet becomes a touchpad that moves the mouse with double tapping to click things.
I don't have a modern HDTV with HDMI 3D support (I only have an LED DLP 3D HDTV) so I can't say whether that would work or not, but when I use the 3D player in HDMI it shows everything vertically interlaced, instead of side by side. I guess you would need to have a 3D HDTV that lets you manually turn 3D on, and then use the normal video player instead of the 3D one to play side by side content. Another weird thing was that 1080p would look kind of messed up when using the 3D player, while 720p looked correct.
The 2 main pre-installed apps are a 3D video player and a 3D image viewer, there are a hand full of other apps like a Browser, Camera, Calculator, Clock, Email, FileBrowser, Gallery, Music [player], VideoPlayer, and Wifi Analyzer.
The 3D video player is not bad, it played 3d mp4s, avis, and wmvs but some files didn't play. I have wmvs that didn't work which the resolution for them was 1280x1440 (above/below) so that may be the reason why. The first time you play a new 3D video, you can select left/right or above/below. I didn't see a separation control.
The 3D image viewer was kind of a pain, it seems like it only works with side by side 3D pictures that have squished aspect ratio, so I had to convert some jps files to work with it. It does have a slider so you can adjust the separation of images, you have to tap the left side of the screen to bring that up.
It comes with a number of apps that are not pre-installed. There is an app installer program that will find these apps on the device and let you install them. It has 2 Ninja type games, one of them is 3D (not stereoscopic 3D) and performed decently. There is what looks like an Asian equivalent of the Android Market.
There is no Android Market, and from what I have read on the web to install the Android Market you need root access, which I have not found a way to do yet.
With out market access I searched for open source apps to install and installed these:http://code.google.com/p/adw-launcher-android/http://sourceforge.net/projects/ghostcommander/http://code.google.com/p/unflobtactical/http://code.google.com/p/softkeyboard/
The camera is a traditional low quality web cam.
For the touch screen I ran TouchTest:http://code.google.com/p/moonblink/down ... st-1.4.apk
The screen seems sensitive enough and multiple fingers work well, but the calibration seems to be off, by about 2.5 mm. I think also if the CPU is being heavily used the response of the touch screen goes down, because I've had it not respond to presses when browsing the web.
The speakers were good, they are actually better than some other tablets I have used. I tried 2 different in-ear head phones and while one of them worked perfectly and sounded good, the other one for some reason the voices of people talking sounded muffled.
The tablet crashed on me once, it turned off by itself for some reason (battery was fine), but of the other android devices I have used, it's not uncommon.
Overall it doesn't seem like a bad deal for $199 tablet.