I bought it to train my left arm's fingers during the day and... sorry, it wasn't the quality I was looking for. I mean the whole thing is quite stable, but when I started to use the trainer it started to make THE SOUNDS... the loud ones... it's like you jump on an old metal bed. I tried to adjust it and add some oil to the metal parts, but nothing helped, so I couldn't use it in my office and even outside during my lunch breaks, because people were damn scared and/or irritated by those shrieks. No, thanks but no.