I have grown to really like my PlayStation Vita. That's not to say I didn't like it when I first started using it, but over the last couple of weeks, my respect for the system has grown into a real fondness. With that said, the system hasn't really had a game that feels "Must Have" to me. The launch line-up is solid, and I do play a lot of Hot Shots Golf, and WipEout 2048.
But mainly, I use the Vita to play PSP games; specifically Tactics Ogre and Persona 3 Portable (the amazing music of which I've already discussed a bit tonight).