First of all, welcome to the forum.
You've asked a very broad question. I'd take a step back and figure out what kind of HP you want out of your car. And then decide how much money you want to throw at it. If you give us a little more info on what you want to accomplish we can help steer you in the right direction.
The kit itself has some very well documented pros and cons I would try the search function and you can read all about it. You might want to specify intercooler, belt slip, and tech support in your search on ATI, those are the quick list of downfalls of the kit.
Oh, and are you doing the work yourself or hireing it out??