Major cons:The main problem is terrible shriek sound especially when releasing resistance regulator. The bike is silent, but this shriek sound is main problem. The workaround is putting a coin between resistance regulator and brake. It little bit helps.The second problem is disgusting smell when using resistance requlator and brake contacts with wheel. After two weeks of intensive using smell became less pronounced, but still exists.Minor cons:Pulse sensor is unhurried. If you heartbeat is, for example 160, and you put yours hands to the sensors it's starts showing 80, then 100 and so on. You need some time, when it become 160.Handlebar and seat regulators are uncomfortable. You need completely take off the regulator to move seat or wheel to other poseation.The computer box is very big and takes a lot of space on handlebar. It could be smaller with the same size display.