The first impression (which included a test run with 12volts at about 10amps) showed good results. I can't comment for reliability but, I am happy with the initial impression. The quality is comparable to a higher end electric fans. It's almost undistinguishable between the two. They appear to be of a good quality plastic, not the cheap, light, fragile stuff you find with a T.V. remote or something of that nature. If they hold up, I would buy them again.