I've had the innovate kit for about a 9-10 months now.. no issues what so ever *knocks on wood*.
For me atleast it's been a very low maintenance addition and I love it. Made the mistake of not getting a header to go along with it, but that mistake will be rectified shortly after I my Tomei EL comes in
. It's really a matter of personal opinion.. The Innovate won't give you jaw dropping numbers but it definitely makes it feel like a completely new car with some serious umph down low. Not to mention that addicting whine.
That being said.. a lot of great options out there, can't really go wrong with any of the "main stream" ones.. i.e. innovate/jackson/vortech. Just make sure you got a reputable and reliable shop/tuner.