I am using the AVC-R with excellent success.
If you turn off any boost controller (factory solenoid disconnected) your absolute minimum boost pressure will be found as you are relying on the actuator spring pressure alone. I found my minimum to be at around 0.6-0.7bar depending upon engine load & revs.
With the factory solenoid / setup I was seeing boost at around 1.0-1.1bar which is very dangerous at that time with standard ecu, hks twin intakes & 3 inch exhaust / downpipe. I think this is the No.1 cause of blown engines assuming no other changes / mods. Very soon after I was disciplined not to thrash my car & installed the AVC-R & KS ecu.
Now with the AVC-R correctly set I can consistency bring this to 0.9bar all the time except on very cold nights. I am running a knightsports (ks) ecu (ok not the ideal, but better than standard) which clearly adds more fuel throughout the rev range with noticeable improvement in smoothness & power.
The AVC-R is a very nice boost controller because it has excellent navigation, good bling bling factor & uses an electronic solenoid rather than just mechanically bleed off boost pressure to the actuator. The price is also very nice...NOT! but heh you get what u pay for.