My 2 days with the Vita...
Uncharted: Golden Abyss... I hate how they force feed you touch and gyro controls. It would be a better experience without the "massaging the back of the console" to climb a rope. Sure, they're optional, but still annoying. So far it's pretty fun. I'm only on chapter 2... it's also awkward constantly looking for places to snap photos for trophies.
Near: This really surprised me. I've read moans here in GAF about how it works. Strangely, I've found more people in the 4 mile radius using Vitas than I ever had using the 3DS street pass. Weeks ago, before I traded my 3DS, I took it to a campus and received not one street pass (even while standing outside of campus housing). However, I stand with the Vita outside a carwash with wifi, and 5-6 people show up in Near. Weird.
Music Unlimited: This is amazing... I love it. I can look up any album (well, almost) and song when I'm home with access to wifi. Then I can choose to download my favorite playlists, albums, and songs from the service and take them with me, for $10 a month. It's pretty convenient when on the go, when listening to the tunes with the Vita plugged into the car stereo.
Remote Play: I tried an experiment... I read here you can't play PS games from the store on the Vita. So I used remote play and was able to play Unjammer Lammy on my Vita. It was pretty slick.
So far, this handheld is pretty damn fantastic.