Turbo Tweak SD conversion

Just wanted to know if anyone knows anything about TT's SD conversion. I was talking to a couple of people from the local GN club last night and one guy suggested the SD conversion and was pretty adiment(sp?) about it. Ive seen some of TTs stuff in action and anymore it seems to lag even the DIY market to an extent. Cant find the link at work but I read the instruction manual last night and found TTs SD powerlogger not to be very intuative as compared to TP or even Dynamic EFIs stuff. I would consider using Saar's nAst1 or $59 before that, but maybe its my lack of knowlege? Opinions?