One word, excellent. I had a similar one a while ago until it broke (think it was a different brand though). Since then I have tried 4-5 different ones, most were the stretchy ring types but I never found them the easiest to get on and when I did get them on they didn't feel as tight as I would have liked. This one is simple to get on (as you just adjust the size) and you can make it as tight as you want. Can't complain for just over £5.