Right now, it is not my account so not playing it since saves will be gone after changing accounts. I had gotten it used so i got it with a couple of games like Gravity Rush, When Vikings Attack, Ninja Gaiden Sigma + and Virtua Tennis 4. Tried every one of them and really digging the look and art style of Gravity Rush. Even VT 4 was decent and fun on VITA despite being old port. Already had Sigma and When Vikings Attack on PS3 so didn't really play them much.
I am about to buy PS+ and create a new US PS+ account since i saw Disagea 3 along with GR and UC for Free
As for what i have tried, i haven't started a game properly yet because this is not my account and i don't intend to keep it. Got a 16 GB memory card so tried plenty of demos. Fifa is surprisingly fun on VITA but i will wait for the latest FIFA release.
After PS+, i will get Persona 4 next month and maybe Soul Sacrifice at launch along with the usual freebies.