maybe i dont have it installed correctly, but when i ride, the coils become loose and start banging around my legs/knees which can get frustrating on a long ride. also, poor instructions on the actual packaging. took me a while to figure it out--it appears easy but it didnt occur to me that it operated in a sliding motion. all things aside, it gets the job done (that is, deters passersby from swiping my bike; but anyone out to steal your ride is going to find a way around this system). so go ahead and get it.