I use the Casio Sea Pathfinder, after using 2 Optimate/Ronstan and 2 Musto watches. The Casio is half the price of the Optimate and a third of the price of the Musto - I like "boys toys" and couldn't face getting a cheap "kids watch", but the Casio is the best for me. It has reasonably large numbers, can be started at 5 mins and reset easily (psuedo-synched) at four, and these intervals are easily changed. But best of all, it hasn't leaked (as the Optimate/Ronstans did), nor has the glass been smashed as happened to both my Musto's. This is a case where cheaper is definitely better - for what I spent on my previous watches I can buy 5 Casios... but I haven't needed to. Its weakness is that the buttons can be knocked, suspending the countdown - but I haven't missed a start yet that I can blame on the watch.