I have the mv50. I'm still on stock 32" mt's on my jkur. I have had my little Chinese compressor for a yr and a half and after a run it stopped pumping air pressure. So I got on their website and discovered they have a 3 yr warranty. I sent them an email with them promptly replying with a possible reed valves failure and how to take it apart to inspect. I sent them a picture of the bad valves and my reply was a tracking number for new valves.
No fuss and great customer service!
The Reed valves are thin metal check valves for building pressure. It's a very simple design with a single piston. After about 18 months it had some gunk build up inside after using it 4-8 times a month.
It takes a few minutes to air up from 18 psi to 37 psi. It's about twice as long as a high dollar ARB or Vivair. So for the price it's perfect.