I have a fidanza 3.2 in my spyder. Its works great, i cant say anything bad about it. But Im about to put my new tranny and stuff in my gst hardtop and Im going to go with the ACT 6 puck in that car. Like I said I cant say anything bad about fidanza because mine performs well, but based on reviews from DSMtuners, it seems that many people dont get a whole lot of mileage from them. But thats just what other people say, so you can take that anyway you want. But I have 5k miles on mine and it still performs well.
But I just want to try something different and I have not heard many bad things at all about ACT (except for the TOB's), so thats whay Im going to try the ACT in my hardtop gst.