Bought two of these sets to begin with. Installed the first system immediately. Performed flawlessly. Installed the second one and was apparent right away something was wrong as the motor kept hanging up and was noisy. Fortunately had the first one for comparison. If I would have started with the bad one I would have sent them both back as junk. Called Vevor and they immediately sent a new motor out. Didn ask for a return on the old. Nice! Got the new motor hooked up and it ran strong and silent but when it got to the magnet stops it wouldn reverse course and kept running. Called the company again and they said we will ship another new motor don bother sending the old back. I immediately ordered another system as I needed three anyway. With customer service like that you can go wrong. Got the new system took the motor out and got the second system working excellently. When the second replacement motor showed up it was a whole complete system. Amazing. Who does that kind of customer service anymore. The systems are up and working. I have a bunch of spare parts. I have bought a ton of other stuff from Vevor. Great company.