A lot of guys also bash them on mach1registry. They say fitment is not perfect and the clamps suck. But the guys who use it seems to like it. I guess if you have the time to make it right it can be a good system
A guy over on mach1regristry had this battery and it lasted him 3 years. But he would only drive his car only a few times a month. He did mention something about it not being good for cold climate weather. I'm still considering getting one :D
Get the PS3. Online is free! If you get the 360 and pay the $60 fee for the year and only use it once a month it will be a waste of money. And of course there's the Blu-ray player and 3D movie and video game support.