I'll admit it, I bought this over the other options because I wanted to fit my RS300X monitor to my bike handlebars and because it says POLAR on it. There were other options. Cheaper options. simple foam ones that look a lot simpler.
This is a faff. You have to zip tie it to your handlebars... which just doesn't work well and means the thing is not very secure - hard plastic on metal just does not grip. (and before you think I haven't put it on right... I've had this for about a year and tried re doing it a fair few times)
Even ignoring that, actually getting the watch on it is fiddly too.
Fair enough, once the monitor's on it stays in place, but I just think that given the options and the price over cheaper versions POLAR could have made a bit more effort...