Vick wrote
For interests sake,are you running more then one amp?
Coz iv heard some amazing leslie effects achieved with the RT-20 and a stereo setup...
Ps: iv never heard a Leslie in the flesh... :'(
I've been scratching my head (watch out for splinters!) to try to remember when I last witnessed a Leslie in action.
They are still around. I caught Georgie Fame on Jools Holland's show a while back (footage a few years old, but definitely 21st century) and he's still doing the Hammond and Leslie thing.
However you can see the problem as well. That kit ain't small and probably ain't light. And once you start playing big venues some of the plusses that Alan mentions probably disappear and you might as well just use a stomp box anyway.