I had to have a portable one. I did buy big once (if 20 gallon is big) until it got stolen from the job site. I had to move from floor to floor for the finish work (3 floors), so this one has definitely served its purpose. I thought about an air wrench, but if it would be corded anyway, I use my big drill with a socket driver on it and get tons of torque. Now that I'm in a "stable" mode, I have to decide whether to upgrade to a larger one and I would rather spend the money on a jointer, DC, TS, etc.
It was the same thing with my tablesaw. Yeah, it was a $100 skill saw that is pretty much only good for basic ripping, but operating on 3 different floors its easier to to relocate it that way rather than hauling stock all over the place. This saw served its purpose. Some of the portable tools I bought were very nice. I bought the barrel grip bosch jig saw (awesome), the bosch power planer, and the Bosch
1617EVSPK 2.25 Horsepower Electronic Variable Speed Plunge and Fixed Base Router Kit.
You can see pictures of the interior finish work me and my brother in law did at:
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The exterior work was not done by me.
Thanks. Jeff