I have a 6" 617, my daughter loves that gun. Also have a speedloader setup for it which makes it much more fun to shoot.
Have you shot a .44 Magnum? I have a 629, few people like to shoot it. Some will take all 6 shots, some pull the trigger once and hand it back to me. I bought it just because I collect S&W's. I'll shoot 6 rounds then put it away, everything else will feel like a .22 after that!
I don't have a 9mm revolver, but do have a 10mm, S&W 610. I usually shoot .40 through it with moon clips.