I've used an RT-20 for years because 1) it's good enough for a loud rock band and a 7-piece jazz band, 2) it was cheap ($100 on eBay), 3) it's Boss so super-tough, 4) it has lots of features, and 5) you can "park" or "brake" the rotors. I think the overdrive on the RT-20 is a bit over the top, though. If you are in an organ trio, the RT-20 might be lacking in some way. Some say it sounds more like a tremolo than a rotary, but I don't know. It's hard to tell when you are running through one amp or even through the house mains.