I own a vita. Bought it day one but only recently have really started using it. There are some terrific games on it. Uncharted, gravity rush, Guacamelee, super star dust, lumines, sound shapes, Spelunky, Tearaway to mention just a few.
I also love playing chess on my phone as it makes me feel like a cultured human being. The fact I never win unless it's on easy makes me glad I'm not someone who's decisions count for much! (I hardly win on easy either btw :-(. )