If you want reliable air the original KOP Thomas compressor is hard to beat. we have abused them over the years and never have destroyed one. I have had a couple of failures but one was the screw holding the reed valve loosening up and the other was trash under the valve. After maintenance, Both compressors still run 30 minutes at a time filling game elements or tires without complaining.
They are available at EStop Robotics:
http://www.estoprobotics.com/estore/...d&productId=55
It's funny how reliability is directly proportional to price and weight.
There are applications that favor one or the other depending on air usage and available weight.