I actually just sold my AC3 white Vita after a year of owning it. I didn't hate the system or anything, but I barely have time to play my PS4 as it is, so splitting my gaming time between them didn't make sense. I also found that the remote play was unreliable at best, it would work for 10-15 minutes and then start to stutter and eventually cut out. I also didn't really like the feel of the Vita's sticks for extended periods.
Anyway, sold it for the exact same price as I bought it so I'm happy. I think the Vita is a great choice for lots of people, it just wasn't for me at this time.
Not really understanding the hate for Sonic All-Star Racing in this thread, I think it's perfectly acceptable, closest thing to Mario Kart since Speed Freaks. Anyway, I bought GTA3 twice and consider it the worst game imaginable. Black Ops 2 was also terrible.