Best boost controller in the market... apexi AVC-R and HKS EVC5 and above. People say AVC-R sucks it's because they don't know how to tune it, the damn thing is almost as good as stock ECU boost strategy. Likewise with the HKS EVC5 and above.
Don't bother with the simple ones, their control on gain is not as accurate or precise, might as well don't bother.