I joined ILKB last month and it's amazing. I needed a jump start to get back into my fitness routine and this was exactly what I needed. It's very intense but it's your workout, so you can go as hard as you can/want. The instructors are motivating and appear to be like a family with the regulars. I definitely have been recommending this to all of my friends.
Think of it like bootcamp PLUS kickboxing! There have been people of all ages and fitness levels in my classes so far. I always leave covered in sweat and like their business motto, I really feel like the fat is melting off.
They have special nights where you can spruce up your workout attire and get fit in 80s style. Check out Groupon first! You will get a one on one type session on your first day so they can show you the moves. Each class is different though, depending on the instructor. But always such an intense workout.
I've been recommending this to all of my friends!