My Input on the AVC-R:
It pairs nicely with the S-AFC II, it has great features, but overall usability? Lacking.
I have one major gripe with the AVC-R, and that's this. I want a boost controller where I say "Gimme, 15.5PSI." and it goes "Ok." I don't want to set a boost level, then guess a duty solenoid percentage, make a pull, try again, make a pull, and so on and so forth. This is exactly what the AVC-R Does.
In order to make the AVC-R hold (say) 15psi. You do this:
1) Set the Boost Level to 1.05 kg/cm^2
2) Set duty cycle to 50%
3) Make a pull, if the boost overshoots the value you want, turn the duty cycle down, if if undershoots, turn it up.
4) Repeat untill you get it how you want it.
Really, while I love the AVC-R's features and advancements, that's not what I think a boost controller should be. I should be able to say "gimme 15psi" and go. It shouldn't take me 2 hours of tuning to set one boost level. On top of that, this makes changing boost levels on the fly a pain in the ass. Sure, the AVC-R has multiple boost settings, but it means you must tune them too. No changing boost on the fly, etc. This also means that adding that extra two psi in first or second, you have to tune that too. Boost level is almost never used, Duty Cycle is very definately the important value.
IMO, the best options out there would be a combination of the Blitz SBC-ID's simplicity (VERY Simple, Select the boost you want, and GO), with the AVC-R's features (Gear Judge, Gear based boost levels, etc.).
Conclusion:
Its features rule, but "Duty Cycle" sucks horse crap.