I have used may timex Ironman swim watches for trackign pool & ocean swims and even took one scuba diving by accident...still works. They have all pretty much lasted me until they wore out (2-3 years) and battery replacement didn't work, OR until I lost them.
I like them so much I once bought 3 of them within 2 weeks because I lost the first two while traveling. :( I tend to take them off while typing on the computer b/c the strap gets in the way.
I LOVE my Timex Ironman lap watch.