Motion sickness, the game.
The title of the game is accurate. There's not a whole lot to say here - it's a well designed, simple concept that's extremely fun. I don't see myself playing this to the point of obsession, but I will definitely play until I unlock everything and see what else I can do with it.
For those of you who are like me, and entirely too afraid to actually participate in extreme sports like base jumping, this will confirm your belief that you're really not cut out for it. You will be perfectly satisfied to sit in your chair, breathe in through your nose, out through your mouth, and imagine yourself floating to the ceiling.
A fun little game that doesn't take itself too seriously, and has enough silly humor to make you smile - note that you won't laugh uproariously, but I don't believe that was the point of this, anyway.
Gameplay is top notch, soundtrack is fun and funny, and I will definitely enjoy any time period in which I play this game, but I seriously doubt I will get addicted to it. One of those rare gems that's worth anyone's time, even iff you just have a few minutes to kill. I, personally, enjoy games that don't require a huge time investment in order to understand what they're about and have fun with them, and this is definitely the type where your boredom will die for a bit.
Plus, after you play for an hour or so you'll exit and still feel like you're playing it.
(Small edit: I mean it's not very addictive. I meant to say that it was fun, but I don't see myself getting addicted to it. Fixed.)