They're very good live, but be aware that they are one of those bands that tries to reproduce the album tracks note for note on stage. And there's absolutely nothing wrong with that, but whenever I pay big bucks to see a live band I like to hear them bring something new to the songs.
YMMV of course, they are all still supremely talented musicians that play some great music. If you do end up going to the show I'm sure you'll enjoy it.
Now, time to listen to a Mannheim Steamroller CD...
