It's heavy duty, that's for sure. I have never seen AZcar stuff in person, so I don't know what's better. The only complaint I have with the TTT stuff is that it's hard to get the car even. I had to put the tall 280Z strut bushing back on the rear because I couldn't get it high enough, and I can't get the front low enough to lo level the car. I guess it's made to be used with camber plates maybe? I had to crank the back up pretty hard that it's a very rough ride in the back while the front I have so far down that the spring is just starting to get loose. This is all with the car lifted off the ground. I would like the car to be an inch lower but I don't feel comfortable with having the spring rattle around almost an inch when the car is off the ground.