I've got about 24 hours of seat time on my now and I have a few things that I like and dislike about it.Power - it's great and responsive, although I have had it bog and "pop" through the intake when I tried to instantly WOT under a load. Grrrr
Gearing - I still think that one tooth lower on the front sprocket would make it a lot better. I plan to get a 13 tooth front sprocket as soon as I can. (which, for those of you that do not know, is the same as a 450r.)
Front Rotors - Why didn't the Honduh engineers put some sort of mud cover for the rotors?!?!? Everytime I go through any sort of mud I have to grab my brakes so that I adjust them down due to the dirt and debris eating away at my pads. (even the Raptor has this...DUH)
Rear Air Filter Bracket - Again, why did the Honda engineers think that a lock-tight-ed phillips screw inside of a tight airbox was a good idea. Stripped screw anyone? When I get that piece-o-crap out it'll be replaced with a bolt.
Front Fenders - don't keep the mud out your face. They do however keep the Sunlight off of the top of the swingarms.

Header heat shield - keeps losing bolts.
Reverse - Is awkward and a PITA to get to in technical climbs or spots where you need to keep both hands on the bars.
Sway bar - Is WAY too soft. Body roll is no fun and makes it feel tippy.
Steep Climbs - this thing does great on those dune climbs. I was REALLY impressed with the ease it went up. It sucks at sand drags, but I believe that may be due to the rims and tires that I have and a out-of-center wheels.
This thing is begging for exhaust and an air filter. (and of course re-mapping the fuel curve)