HF 21 gal. air compressor?

I'm a bit low on compressor size as well. (27 Gal. Craftsman) really struggles with old D/A I have. Just ordered this. Claims "low air consumption (2.5 CFM average)" . I hope I'm able to get a little more work done now, I'll let you know in a few days.
AIRCAT 6in. Dual Action Sander — 10,000 RPM, Model# 6310 | Northern Tool + Equipment