I purchased the Jetblack S1 Sports Trainer online in the middle of a lockdown so I was happy to receive anything at all. It arrived when promised, after five or six days. It is easy to set up and operate. It takes about five minutes to swap over from one bike to another because of the need to replace the quick-release mechanism. I found it acceptably quiet although I use it outside not inside. Only limitation was an inability to connect to my phone. It seems I need a sensor of some description. To get around that problem I attached an old-fashioned speedometer to the rear wheel. This is adequate if one bike remains in the stand. Otherwise, it is difficult to calibrate the correct resistance. Overall, I am satisfied with my purchase.