the thomoas i got seen over 250 psi on my buddies truck b4 i got it, i gota get it to 180 so i have enough air to lift my ranger. its got a water trap and 800 psi check valve on it to, its the big 4101 1/3 horse.
I've got a Viair 550, Its been replaced once and the replacement has been rebuilt once, now its broke so I just use my SCUBA tanks. But to answer the question, I'll never buy a Viair compressor again.