I like it for both reasons. Mainly, with the Dual Solenoids and the Power Meter add-on it performs really well. When adjusted right the control holds boost really well. Generally, it only spikes up .1 psi at most. The blitz setup has a specific tunability for sequential type turbos(factory setup) or for any other type of set up. The Controller is very fast acting, and extremely easy to use. I have installed EVC IV's,Pro-fec B's, and AVC-r's on different cars and I wouldn't trade the Blitz for a single one of them. The only other one I would consider for my car would be the EVC IV, but the fuzzy logic on that controller does no good with the stock turbos. If your going single right away, then it won't make as much of a difference.
Jesse