The Ronstan Clearstart is exactly the same as the Ultimate Sailing Timer (different colour). I have the Ultimate. As said before, it can easily come out of its holder - several colleagues have lost more than one overboard. I've wrapped insulating tape around the circumference of the holder and that has solved the problem. The beeper also fails if it gets particularly wet, but dry it out and it's fine again. The display is brilliant and the sync function is its best feature.