It took a while to install but after a few tries I got it. My only complaint is that the air pressure really slows down as they approach requested PSI. I want the valve to stay fully open until the desired PSI is reached. When it's time to hit the road, I can still hear a small amount of air coming out of them, so I'll never get to the desired PSI range unless I leave it permanently and slowly deflate. For the price, I think it's worth the effort.