Hey mate. With many things, I buy it because I simply want it. With the Vita, that was the main reason behind it. My main intention was to get a Vita, buy Unit 13 when it released and then wait for the tampering so I can play homebrew and whatnot.
The device itself is phenomenal. I think that its first revision will have many improvements, but I haven't really got any complaints at the moment.
The 3G, from what I've been told, is not used for gaming, that is strictly wi-fi. I wish I had done the research because I regret spending the extra $80 or whatever it was for the 3G.