I like my Vita - especially with Playstation Plus. I got it for P4G and I don't regret it.
But.... it doesn't have that many great games yet. Tearaway, P4G, maybe Gravity Shift - but apart from that, what does it have? Uh, Soul Sacrifice? Maybe?
It has some other great games like Guacamelee and Thomas Was Alone.... but you can play those games elsewhere. The Vita still doesn't have enough good exclusives to make it a worthwhile purchase, unless you're a Persona nut like me.