I think their great for their price.
I have a speedAire 25 gallon with the Oil system just like that one. In fact, they are virtually identical, minus a few differences in casting design.
Definately get the oiled system. It lasts longer, is like 10x quieter, and is less stress on your electrical system. keep in mind, this one is a 240V.
I doubt you have to worry about the CFM issue- with that much reserve, the only time you really use it up is during extended painting, extended drilling, extended just about anything. If you ever find it to be the case, dont worry- Just piggy back another tank on- it will have double reserves.
I say go for it. /forums/images/graemlins/smile.gif