The worst product/brand I've ever used. We have a Rico M elliptical machine and it is the single loudest thing in the whole house. It creaks, squeaks, screams in agony whenever you use it and generally feels like it's going to break at any moment. It is also impossible to fix. Generally you can access pivot points in a Elliptical machine so you can lubricate them. But Kettler makes most of them inaccessible, probably in the hopes you'll give up fixing it and buy a new one. Even after attempting to disassemble, lubricate, re-tighten and reassemble; it continues to be the loudest thing known to existence. It's so loud that it even drowns out music coming from my headphones. These are definitely very poor quality products, and I have to assume all Kettler products are amongst the same lines.