I'm a lover of all Firm products, so I may be biased. But I love the Firm Wave and accompanying DVD's. The Wave is similiar to a "step", except it's curved, and can also be turned upside down for "rocking". That's the feature which makes it unique. During "rocking", you not only work your legs, buns, and thighs, but also your core. You're always working your core when standing of rocking on the wave, mainly because you're fighting to maintain your balance. Imagine a surfer's abs, and you get the idea. It's the same concept. The blue wave is sturdy and durable. I've not had any issues with it, and I've had it for a few years. I've read other reviews in the past, complaining about the durability of the wave, but it's lasted great for me. I've also read complaints about the blue mat that is supposed to help prevent slipping. For me, no complaints, it does just that. The Firm has made several DVD's to accompany the Wave, including a variety of Cardio, lower body, abs, and sculpting. They are all high production quality, with great and experienced instructors. I'm impressed. You won't get bored. The Wave and it's DVD's can be used by both beginners and advanced exercisers. I'm intermediate, and really felt sore in my legs after using this for the first time. Hand weights are used in most of the workouts; you can vary the weights based on your level. The Wave is probably not the best choice for someone with bad knees; there is lots of stepping, lunging, and squatting. In summary, it's effective, innovative, and fun.