I've had my Nomad 2 for well over a year and love it, been working flawlessly.I also use it to refill a 3000 PSI, 48 Cu Inch bottle for my paintball gun. I just run it for 10 minute sessions with plenty of time between sessions to cool off.
No problems with mine, I have a double bottle gun it fills to 3600 psi under 10 min. if I don't shoot below 3000psi with it. The urban is just a couple of minutes. The Ataman I have fills to 4350psi in about 5 min. Mine is 2 years old. Worth every penny for sure.