I'd been meaning to get something like this for a while, and had actually tried to buy one from an alternative vendor. Their promised discounts didn't emerge at checkout so I binned it and found this for less.
I've worn it on a 100km ride and it didn't fall off or break, so it's a winner! The only reason I've not given a fifth star is because of the type of clasp- I have quite large hands, so to trim the band to the right size whilst still being able to fit everything over my hand is quite an art.
Good kit though.