Vacuum Pump

Anyone here using a Gast brand (rotary vane)vacuum pump for infusion or vacuum bagging?

Or:

This pump?
Is this one good for vacuum infusion of small to medium size parts?

http://cgi.ebay.com/Robinair-VacuMaster-15600-6cfm-Vacuum-Pump_W0QQitemZ120136055930QQihZ002QQcategoryZ109488QQtcZphotoQQrdZ1QQcmdZViewItem#ebayphotohosting

I don’t think those Air Conditioning pumps are rated for continuous use.

Not all “Robinair” brand pumps are for A/C use? does Robinair make a pump for our purposes?