I a serious rider and would never go without my helmut mirror. I cannot turn my neck that great and it can throw me off balance jerking my head around. I love the little mirror an look out from rear with no issues it gives great coverage. Outside of the helmut I consider it the second most important item I need for a ride. More important than wheels, pedals, ect....... It does not slow me down and speeds me up because I have better information.