I use a "heavy duty" Repco unit. First one died after 5 seconds of use, was replaced by Repco with the heavy duty version due to them not having any of the one I originally bought. New one is still slow, takes forever to pump up the tyres on the commodore (just from 35 to 40psi), takes even longer to pump up a flat on a Colorado, I thought it wasn't working. I'd hate to see how slow the first one would've been if it had worked.
I wouldn't buy another one.