3D on this Sony VPL-HW55ES is especially good, for a 3 panel device. Crosstalk is minor, varying depending on content (some content has crosstalk already in it), and the "brightness" setting on the projector's menus for the 3D glasses. The brighter the picture, the more crosstalk, so you have the option of dialing in the best compromise between brightness and lack of cross-talk.
In 3D the projector is reasonably bright, keeping in mind that 3D is not going to be more than about 40% and likely closer to 30% as bright as 2D. As is therefore usual, you want as much starting brightness as possible. This, by the way, gives Sony a real advantage over the competing JVC projectors if you are a fan of 3D as I am. The JVC's simply aren't as bright. We haven't gotten in the new JVCs yet - they are supposed to be slightly brighter than last year's models , but overall those projectors have never been as bright as this Sony, which by our conservative measuring (we don't measure absolute brightest, but brightest with a good watchable picture).
The VPL-HW55ES looks acceptably bright when I'm viewing at 100" diagonal on my 1.3 gain Stewart Studiotek 130. At my full 124" diagonal, brightness with the glasses control set they way I like - one up from best/darkest - brightness was a bit below what I'd like to have but still watchable. I'm not a fan of dim, especially 3D. I keep my cineplex viewing of 3D IMAX 3D theaters, as generally I've found them brighter than the smaller screens. I do, for example appreciate the better brightness (in Dynamic mode) of the Epson 5030UB/6030UB, when projecting the larger size, but it's not enough difference that if you were torn between the two projectors, I wouldn't recommend buying the Epson only for that extra brightness for 3D. Roughly speaking, the difference between the Sony and Epson in 3D brightness is roughly that of going from lamp Full power to Eco-mode on the typical projector.
Bottom Line, the 3D picture works for me. And, BTW you'll have more accurate color in the brighter modes like Bright Cinema- uncalibrated, than the Epson competition in its uncalibrated Dynamic 3D mode. I thoroughly enjoyed 3D viewing on the Sony.