Crosstalk could be better. I do believe it is still more evident than on the competing Epson LS10000 and the Sony 4K projectors. It's been over two years since I reviewed the previous generation, so I my memory is hard pressed to determine if JVC improved it at all. I suspect it is better, but it's still not great.
Again though, it's tough to demand 3D quality rivaling 2D. As much as I do like 3D, I've learned that in that area some compromise is still needed, starting first with brightness. As I said early on in the review. This may well be the best 1080p 2D projector in terms of picture quality. 3D was left out of my description for a reason.
At best, very watchable for most of us. Those offended by crosstalk will be more offended than usual.
The 3D Emitter plugs right into the back. Optional. $99
JVC's glasses are RF. The Emitter is a small device that plugs directly into the back of the projector into its DIN connector. Very simple, and doesn't stick out very far.
There are now lots of 3rd party glasses available. Current JVC's should also be interchangeable with Sony and Epson 3D glasses, but more to the point, there are low cost alternatives such as those from Samsung (about $20 a pair), that are lightweight and comfortable. The battery powered Samsungs are very light (aka comfortable). I used them, as well as the JVC glasses at different times in my viewing.
3D should be much fun with the JVC DLA-RS6710. Kids will love it, other family members that like 3D (my wife is not a fan - mostly because of the glasses), who aren't as critical as you or I, will be just fine. Hey, I can live with the JVCs minor issues, of greater concern is it sure can use more 3D brightness, being a little less bright than the competition (well, not much so compared to the Sony VW350ES).
Works for me! But still room for improvement.