I have been try'n out a few different one's over the past few years on my 65" and recently tried Optoma RF glasses and find them by far the best. Whay? All other systems seem to have range issues with my 65" DLP including DLP Link glasses.
The 3DA1 has went up in price... I got my 1st one for like under $60, I paid $90-ish for the second one.
I have one for each of my 3D sources. Direct TV and PS3. I am greatful the 3DXL has 2 inputs for the theater.
Last I checked, even at 90 something dollars, the 3DA-1 is getting hard to find. Amazon is out, as is Buy.com. hmmmmmmmm, I thought these would be getting more plentiful once Mitsubishi upgraded the software on the mid to high level tv's.