I am still loving my Vita. I play it most every night.
I just got platinum on Zero Escape and I have played through Tales From Space: Mutant Blobs Attack. Trying to get 100% is tough on this game.
Also, downloaded Hard Boiled Chicken it is a really nice side scrolling platformer/puzzler type game.
The freebie games are fun as well. Jetpack Joyride, Frobisher Says (Wario type game), Fireworks (AR game), Cliff Diver (AR game), and Treasure Park are all great games...especially for the price.
If you are a PS Plus subscriber you get even more freebies every couple of weeks. I don't regret buying it and if the price gets cut it is definitely worth your money.