(I broke 3, trying to take it apart to correct the mistakes I made mid-assembly. I actually purchased this to use as a plant stand/center piece for my plant window. Although I appreciate the fact that it is lightweight, sturdy in build and great for small spaces it does not run smoothly or motions like an elliptical. I was a little worried about putting the tube tip in my ear but took a chance and ordered it. The XL is fine and these things stretch. The difference being these are a hundred bucks cheaper than those other brands. Looked for bar to ?lock into? dewalt table saw mitre guides. They are not as loud as my Bose over the ear headphones and I did not expect them to be. NOT AT ALL. I feel these are better then the original cushions and at a almost half the price.