That's interesting. Most of the stuff I have read says that the ARB compressor is more popular for extreme usage.Anecdotally from talking to other members of the club we were in over there, I would say the Viair is significantly more reliable.
I trust your direct experience. I'll take a closer look at Viair. Their pricing is more reasonable than ARB's for compressors (at least in the US.)We did 1-3 rides almost every weekend for about 4.5 years. Every ride would involve filling at least four and rarely as many as 12 tires from 9psi up to 35 psi in hot, dusty, sandy conditions.