I got this yesterday so it is an early review but I must say I am very happy with it and I have no doubt this is going to help me tone and even build some muscle. I just had my first workout with it and let me tell you, it is not as easy as it looks, especially if you are using one hand. Of course, if you live in the gym this is a piece of cake but for people like me who don't, this is perfect.
It is a quality product and for this price and excellent buy that you will not regret. My arms are tired right now and I can feel it in my muscles.