I originally erred and advised that the BenQ W1500 came with one pair of glasses. Turns out, like many 3D capable projectors, none are included. The latest in 3D glasses for BenQ means that their new 3D active glasses are rechargeable, rather than using small button batteries.
More to the point, the 3D picture is clean. As is typical, single chip DLP projectors seem to have no native crosstalk issues of their own, so visible crosstalk when using the BenQ projector and glasses, if you see any at all, would be inherent to the content, rather than the projector's 3D processing, or latency of the panels/chips.
Weight wise, the new BenQ glasses are reasonably light, but hardly exceptionally so. They weigh in at just over 46 grams (about an ounce and 2/3rds).
Back to the 3D glasses for a moment: By comparison, Epson's classes (also rechargeable and RF), weigh just 37 grams, and Panasonic's about 3 grams lighter than the Epsons. Our lightweight champs, Samsung's battery powered (but not rechargeable) RF glasses, weigh just 23 grams - exactly half of the BenQ's. Those Samsungs are compatible with Epson and Sony projectors. Comfort is OK not great on the BenQs, at least for those with a large head like mine. Note that I wear them over the top of my regular glasses. (My glasses, BTW weigh in at just over 22 grams!)
3D looks great, overall. The W1500 being rather bright, I find that at 100" diagonal, The Hobbit, and other 3D content looks reasonably bright hitting a 100" 1.3 gain screen. At my full 124" diagonal, the W1500 is still pretty good, but running out of brightness. I have watched The Hobbit all the way through at 124" and I would say that the Epson Pro Cinema 4030, with it's glasses setting on medium, is just a little brighter than this BenQ. Ultimately, I think about the only competing projectors in 3D, to the W1500, that you would consider brighter, would all be 3LCD projectors. (OK, if you are going really low end - sub $1000 you can find brighter DLP projectors, but they aren't a quality match for this BenQ.