Had a greddy profec b for a few years now and can't fault it, does exactly what i want it to lol! Imo i think people think they're going to transform their car with a fancy boost controller that promises to do this and that, when in my experience they just don't. Having said that i know some of the aftermarket ecu's work very well with their own boost solenoid and boost controlling software, though this is a little more advanced than a standalone effort.