I bought the rapid air and installed about 3-4 years ago and have not had one single issue. I read somewhere that some Nascar shops have gone to rapid air system but in reality there was probably an endorsement deal so you can't just say they use it because it is better but I guess you can say that if it failed or was just bad they would not allow it in their shop.
Just a hint. The tubing comes in a coil and to get a neat job you have to uncoil it and allow it to sit in the sun until you can work with it. The connectors are great and I love the stuff.