So far I have tried:
Tilt brush - this is a killer app if there ever was one. Your creativity goes bananas with this, even if you are not an artistic person.
Job Simulator - really fun. So far I just finished the restaurant cartridge but using all the stuff around you is intuitive and fun. And the puns are funny
Audioshield - also really fun, playing electronic music like daft punk, pendulum or the glitch mob keeps a nice fast rhythm. Other genres like metal suffer a little bit (specially the more lyrics it have), sometimes having to block when it doesn't fit much. But it is still fun for those if you like the music.
Holopoint - cannot opine much on this one, I only tried it for 10 minutes cause my GTX 770 doesn't seem to resist it, it kept losing frames while looking at the holograms. I can see how it can be really fun, but dodging those shoots from side to side and turning around requires lots of space. I have 2,3m x 3m and after dodging a few half of my attention was centered in keeping track of my chaperone, cause the dodges requires you to move mainly the head quite fast to the sides. I can see someone hitting a wall or furniture quite badly with this one.
Budget Cuts demo - quite fun too the portals feel natural and so does the interaction with the weapons and environment. Bad thing is that sometimes you can end up on a corner of the chaperone, moving with the portals and having to find a peaceful moment to recenter yourself to the middle of the room and teleport again to the point where you wanted to be in order to have space around. Which can also make you end up with a mess with the cable. Good-bad points also to the immersion, if with the previous one I feared for the chaperone in this one I hit a closet and a lamp (don't ask how) with the controller. Also by the end of the demo I felt a bit nauseous, probably because by the end you have to teleport more often and get through a section where you have to crawl/crouch.
H3 - it is awesome the level of detail that Anton included in the weapons, it is really fun just to mess around in the training range and the desert map. My card suffered with this one a bit also in the warehouse scene cause there are many models around, the other levels were fine. And the grenade mini game is super fun! My record was something like 126k points, I really want to try until I get every block down.
Theater mode - I had a quick look to the theater mode for videos, looks good, not much to add, it fulfills the function.
I still have to try Fantastic Contraption, IKEA (lol), Irrational Exuberance, The lab, Spell Fighter, Realities, Out of ammo, DCS and Elite (these last 2 probably won't work with my gpu).
DK2 didn't convince me much, and was a bit afraid about the quality of the Vive as a consumer version. But these games, the quality of the headset (SDE is practically not noticeable compared to DK2) and most importantly the tracking and room scale makes me think that VR definitively has a brilliant future ahead.