I made my way to Body Barre after buying a Groupon for ten classes. Those ten classes were enough to tone my arms to their best shape ever. Most of the instructors were fun, nice and professional, with the exception of one. Looking back, I wish I could have avoided Liz Denny's classes and I think I would have enjoyed my experience more.
Overall, it's a great workout. You'll definitely get your money's worth. My advice to other newcomers, avoid afternoon and Saturday mid-morning classes. They're generally too crowded to get the best work out possible. Also, If you go during the day, there's a girl who moans really load (sounds like sex noises.) It's not a big deal, but it can break your concentration during tough moves. It's hard to focus when you're laughing and everyone's ignoring the elephant in the room.