A few things about 3D: first of all, it's just amazing.
Sainsonic glasses, black 144 Hz work very well. As said elsewhere, blacks retain a mild red tint, but it's hardly worth mentioning, all things considered.
I recommend these glasses - they don't "randomly" lose sync. They deactivate only if the glasses are turned away from the screen for five seconds. When you look back, they reactivate, with a 50/50 shot of being on cue. You do not TYPICALLY look away from a screen for five full seconds unless you are seriously distracted, like leaving for the restroom or to get a cup of water. In these cases, you would remove the glasses anyway. So if losing sync seems like a big deal, which it really is not thanks to the toggle switch, just take them off and leave them facing the screen and it won't ever (in my 4 movie experiences) lose sync. It's not anything like the problem I feared.
Benq w1070 3d really is incredible. 144 Hz flickering is invisible, though not undetectable. That is, you know SOMETHING is happening, but you can't actually see the flicker. It seems to be the slowest it could go before flickers would be visible for me, but even at 96 Hz, this dlp link 3D would still be incredible. My dad has a theater room with a 2011 Panasonic, I forget the model, but it's about $2800. It is LCD. The 3D on this is BETTER, though only one year newer, and 1/3 the price. If its all about 3D for you, this really is the entry level to get. But if 3D is for irregular use, I suspect the hd6510BD would be sufficient. But I watched 4 movies - RIPPED files, not even from a 3d bluray, and there was not ONE error. Not one instance of flickering or ghosting, period, and I was attending critically.
You lose color, contrast, AND resolution in this mode, so in a way, it really is only as spectacular as the usual, vibrant 2D image you usually get. But it is no worse, just different, and plays apparently without error. I recommend the biggest screen possible for 3D viewing. My screen is 100". A nice size. So much of the back wall is visible though that it staying there in the same place kind of steals momentum from the 3D. It's difficult to describe, but I can tell a larger screen would fix this.