For 3D, of course, the X35 projector works with optional 3D active glasses which means if you have a lot of friends, more money for glasses. JVC's got some of the priciest 3D glasses out there, at $179 MSRP.
True, they are RF (not IR), and they are rechargeable, but the same can be said for similar glasses for the Epson projectors (RF and rechargeable - and even lighter), which are only $99 each. JVC's glasses are reasonably ligh at 38 grams, about 4 grams heavier than the Epson's and more than 10 grams heavier than the Panasonic's which are the lightest active glasses I've weighed. For those of you not into metrics, the JVC's glasses weigh in at about one and a third ounces. Comfort was reasonably good.
Note, you could use the old emitter with the older IR glasses from last year. Unless you are upgrading, and already have some of those, definitely go RF. Not only more convenient, but I expect that the older IR glasses won't prove to be as bright, and may be in part responsible for the less than wonderful 3D last year.
I should mention the emitter for the glasses. It's a compact a couple inches by a couple, and maybe 1/2 inch thick. I think it's great that it just plugs into the back of the projector into its connector. Last year the IR remote was at the end of a cable so you could position the emitter for best functionality with glasses. Of course, the RF emitter doesn't need to be in the open with line of site. If you are shelf mounting, it makes the projector about 3 inches deeper than otherwise.
Look for more affordable 3rd party glasses, but I've yet to confirm that 3rd party RF glasses that will work, are out there.