I had one, didn't like it. I think it's junk, but I suppose for the money it's ok. My air compressor couldn't keep up with it either. (6hp, 60 gal.) But, my air compressor won't keep up with any sandblaster.
When I bought it, the guy at the register said he'd give me $100 off if I bought a $30 warranty. I assume they make a commission of selling the warranty. So, that's what I did, saved a lot of money. Well, when I took it back, they gave me back full price, with the refund on the warranty, so I was up by at least $100. HAHA. I even had my receipt when I returned it, but they didn't pay any attention to the selling price.