30, I would own one if the Shelden wasn't an option as I will not buy Chinese unless I have to. But, it is very slow and after you add in the cost of all the needed add ons to even compare to the others, it really isn't that inexpensive. Again, I think the shoebox is awesome, but the slow speeds make it very hard to compare to even the chinese units. I really don't mean to be a dick about it, but I fill my tiger shark from 3000psi to 4700psi in under 7 minutes. I totally get your point, and if the Shelden didn't exist, I would own a shoebox. However, the compressors above the shoebox and chinese will spoil you very quickly so I am very biased!!