From my research the ratings of HP or CFM are subjective.
Usually the Wal-Mart/Home Depot/Lowes brands are highly over rated.
Look for US made models and ignore the CFM and concentrate on the HP rating. Many sites will advise the opposite.
I'll not sell the Campbell Hausfield bought at Wally World, but will supplement it with a quality 2HP US made unit found on Craigslist, found for 1/2 the selling price from Grainger.
If need be I can use BOTH to supply my needs while still having the mobility of the cheap one for mundane jobs.
IMHO, the 110V units will just not cut it for any work other than the occasional need. ANY 220V model is better than a 110V one!
