Mixed bag with these guys. I lost an amp and the next guy I had working on my car found the ground wire wasn't done right and was loose. They also were a little more brutal on taking my car apart than I had hoped. My install was okay but they sold me a cap which I probably didn't need and didn't spec out the fuse combo right for my system which was later replaced by my same shop guy with a nice rated breaker. On a 1-10 I put them at a 5. Better options out there!