This seems a pretty good deal. Amazon sells it new for $17K, and it is out of production.
The design is unique. Only one lens for two light gates and bulbs, collimated internally to show through the single lens. This eliminates the keystoning with dual projectors. Passive polarization (circular, I think) is also internal, so there is nothing to place in front of the lens.
You would need a reflecting screen to preserve the polarization. This is not a white screen sequential frame DLP.
The 2500 lumens, likely measured at the screen after projection polarization, will be cut 50% by the viewing glasses, but that's still pretty bright.
Even at about 1/3 retail it is out of my price range but $6K is not a bad deal for a 3D projector with the brightness of a dual system.
The only drawback I can see is that the throw ratio is only 1.3:1. That means that it can't be further back from a ten foot wide screen than thirteen feet. If you have a narrow theater space about 20 feet deep, this projector would have to be amidst or over the audience.