Well, if anything, it show's they've got a great warranty and equally great customer service. Right off the bat, that's a better deal than you get with Kenne Bell.
Nothing against the Paxton and Vortech units, but they don’t bring anything better to the table than ATI does. Just a different system. If the ATI kits were really the junk that their haters state they are, why aren’t they out of business by now. Instead, they’re thriving!
I've heard mixed reviews with regards to the Procharger systems as well. It seems to be a love them, or hate them sort of thing. The ones who hate them usually complain about the noted "leaky seal" problem or the odd unit throwing the serpentine belt due to a poorly designed housing bracket. Of that bunch however, I've noticed in at least half the cases were due to owner/install error, (overfilling the unit seems to be a pretty common one) and said owners not taking responsibility for their actions (it's real easy to shift the blame to the manufacturer to take the pressure off of yourself).
Of the ones that love them, every one of them is very impressed with the simplicity of the install and power levels they make. The comments I've heard with regards to their supposedly "inefficient impeller design" always seem to strangely originate from competitors selling a different unit. I've always found it kind of funny that where street applications are concerned, such an inferior product seems to consistently out power the competition at all boost and RPM levels.
So take both the positive and negative comments for what they are. Of which most of the time are based on opinion rather than fact.