What tools are you hoping to run? A DA Sander requires different things then an impact. Is this going to be for small jobs or do you want to run a air ratchet or sander all day?
My dad had this one in his garage for years. It is now in my brothers garage. We did everything mechanically (timing belts, motor swaps, trannys, etc) and never had a problem. Biggest PITA was having to run a 220v circuit to the garage.
My buddy has this one. If he tries to run air ratchets it is a PITA because it is always running low. However, it is great for impact guns and stuck bolts, while using hand tools to do the rest of the job. He also gets away with less air hose and being able to use any outlet. He can take it anywhere there is power (a friend's house to help, etc).
Hope that helps.