This was a great idea for those of you who need help remembering what lap you are on.  It was really good the first two days I used it.  It is small and not much of a bother while swimming, but did take some getting use to.  I usually swim at least one mile a day and in a 25 meter pool this is the ticket to counting your laps.  My problem arouse when exiting the pool on the 2nd day of using it.  I grabbed the rail to exit the pool and bumped it against the rail just enough for me to notice it.  Apparently it was enough to damage it and now it will display a zero but will not count the laps.  Great idea but needs to be durable enough to last.  grabbing a railing to exit a pool should not be damaging to it but it did die on me.  I would  considered this again in the future if it was more rugged for use.

When swimming laps, I spend all my time counting, remembering which lap I'm on, and then all of a sudden realizing I probably just went from 69 to 80. The lap counter allows me to not have to remember anything except to push the button. I wear it on my right index finger and press the button with my thumb. My only slightly negative comment is that I wish it had a little better positive feedback when I press the button. Sometimes I feel the click, other times I don't but it appears to have registered the lap everytime. The size adjustment is fine for me and securely locks to a size. I even gave one as a Christmas present.

Works great