I Love Kickboxing will knock you on your ass, but everyone there wants to help you get back up.
I bought a three-class tryout package, and the classes are all set up fairly similarly -- 15 minute warmup and 45 minutes of various kickboxing rounds. For your first class, the staff pairs you with a trainer to teach you the basic moves and encourage you through everything, which is helpful. While I am not new to working out, that warmup was ROUGH. I thought I was going to throw up or walk out, but the staff sat with me while I cooled down and helped motivate me to go back out and try what I could when I felt better. I've seriously never met nicer people who truly do want to see you succeed at something new.
I was more prepared for my second class, and took the warmup much slower than everyone else so I could focus on the kickboxing stuff. It feels seriously amazing to punch and kick your frustrations away! I would highly recommend taking your first (or all) warmups slowly/cautiously so you can experience the reason why you came to kickboxing.
The downside is the price. They don't offer walk-in/drop-in classes, and even the cheapest package (for a 35-class punch card) will cost you between $450-$600. Is what you get outta the class worth that kind of cost? I am still trying to decide, but I WOULD recommend checking them out on a Groupon sort of deal and seeing what the classes and people are like. Seriously -- they are SO nice!