[SleeperCivic]

I have a bunch of insight. First, this is how it works:

You have (1) the control unit with the adjustment knobs and (2) the boost solenoid. Depending on which turbo you have will dictate how your boost controller is setup.

The basic function of a elec boost controller is to delay the boost signal produced by the turbo to the actuator (Greddy 15G) or wastegate (DRAG, FMAX, etc). The solenoid does this by receiving a signal from a boost monitor that you place somewhere in your vacuum line on the manifold. It monitor that signal until the boost hits the spot where you've set it. At that point, it lets the boost signal get to the actuator/wastegate.

On the matter of quality, the AVC-R performs other functions than just control boost (if you didn't know that), it's like a S-AFC and boost controller/gauge in one. They're very well known for boost spike, though, which, in a racing environment, can be disasterous.

The new mini Blitz model has a electronic boost gauge built in and a protection circuit to prevent overboost, which will destroy you.

The Greddy Profec B spec is plain with adjustment knobs, but is claimed by many to be one of the best, even better than the Profec A spec that cost more and has more features. I have the B spec and it has NEVER spiked on me.

Hope that helps!