I didn't use their parts mainly because I couldn't afford to wait for shipping downtime but I was referred to them quite a bit and their tech and help was very appreciated. The word I got often was that they did sell quality stuff and not junk.
D&D performance is run by Don Walsh Sr. and son,last years PRO 5.0 champion. Their parts are the best quality you can get,cept for switching to G-Force internals. They've been around for a long time, and I've never heard anything negative. Always willing to answer tech questions,and they dont rape on shipping. I won't deal with anyone but them.