I have one. My compressor is a 13 cfm unit and it can't keep up. Even when it was new it couldn't keep up with the air demand.
BTW, the sand needs to be DRY! I haven't used the blaster for years.
I haven't tried commercial blasting grit.
You're right about the cost of commercial blasting, I had a few items from my DeWalt radial arm saw blasted and it cost about $150.
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