I'm perfectly happy with my GReddy Profec-B Spec II. Itt wont do rev/gear based boost, but it controlls boost accurately and without spike. Setup is easy once you understand how it works and what everything means (the manual is very good, but it still need some thinking through)

So I'm happy - it does everything I need it to do, and is tiny so easily hidden. The actuator is well made and the loom is very good quality.