Never had any experience with their headers, but I had their coilovers for my 6th gen for about a thousand miles. Sadly, that's all I got to use them for because I got into an accident, but I really liked them. I could go from stiff to soft easily just by changing the fronts. Never touched the rears, though that would have made a bigger difference.
I was gonna go with them for my new ride, but nobody had used ones and new ones were around a grand and I preferred going with what most people left great reviews on, the Tein Basics.