You might also want to consider the Roland AC-60 or AC-90 amp AC-90 . It's more expensive, about $750-799, but it's a one-piece dedicated acoustice amp/PA. I feel the CM-30's offer more inputs and a feature or two, but no effects.

The CM-30's are great for something in their class. They are not a replacement for a good solid amp with maybe a 12" or 15" speaker. It depends on what you are looking for. An RD-700 would sound very good and tight thru CM-30's in a home studio.