As was posted in another thread, XForce 3D has been bought out by
http://Ultimate3DHeaven.com" onclick="window.open(this.href);return false; I got a shipment of these just last week actually and have to say that Carl from there was quite forthcoming with answers to my questions.
I got two wired and two wireless pairs and now I see why other recommend the wired ones. The wired ones are light and seem quite well made. The wireless ones look and feel like something from the 70s (not that I was alive back then). They are heavy and very uncomfortable if you have an above average sized nose (as I do). They actually look like these:
http://ultimate3dheaven.com/anisprowi3dg.html" onclick="window.open(this.href);return false;
Sofar I've only really tested out the wired glasses with my Benq BP6200 and, as expected given the lack of internal synchronization with the input, the image starts out good and gradually the eyes go backwards before going back to correct (hard to explain). I'm planning on adding some circuit to be able to provide an internal sync to the projector. Should be pretty easy to source this from the stepper motor controller for the colour wheel.
On the plus side, these glasses hooked upto the projector gives very little ghosting at all when the sync is correct. I can't really speak for the wireless ones as I believe I'll need to get new batteries for them.
Let me know if you have questions on these.