I love Rise Nation! The workout is so challenging and I am always drenched in sweat when I'm finished, but the music and dancing lights really help distract you and get you through it! I love that it is only 30 minutes. As a new mom, I can be in and out and still get a tremendous workout. The instructors are all high energy. I highly recommend the versaclimber if you are looking to burn fat with a high intensity and low impact workout.
It is pretty pricey, but almost every group fitness place in Cleveland is these days. They do run several specials a year though, so I always wait for those.