this really depends what tools your wanting to run I also have a craftsman 30gal and and frankly I feel its junk. it has such low volume if you want to run any tools impacts, saws, sandblasters, sanders get something bigger. if its just for hobby work its fine but for any real shop work most of your time will be spent waiting for the compressor to fill back up.
The red Craftsman 30 gallon and the black Craftsman Professional 27 gallon are very different beasts. For example, I ran an Aircat angle die grinder, which consumes 7.8 SCFM at 90 PSI for about 2 hours once. The compressor was running most of the time and it went without a hitch. Being as quiet as the compressor and the Aircat are, they were a pleasure to use. Mind you, that's well over its rated 5.8 SCFM delivery at 90 PSI. The compressor did nothing but deliver.
I realize that a compressor with a tank this small wouldn't be useful in a pro shop, but I don't have a pro shop and for every air tool I own, the CP 27 upright has been perfect. I change out the oil once a year with De Walt synthetic compressor oil. I've never seen any metal shavings come out with the old oil.
Also, I hooked up a dedicated 120 volt, 20 Amp GFCI circuit to my breaker panel for the compressor since it would occasionally trip the 15 Amp circuit breaker that ran through my house and through the three upstairs bathrooms. I haven't had any power problems since I added the dedicated outlet.
