Sorry, but I have to disagree. More specifically, I have a problem with the Optimum Time version, which looks exactly like the Ronstan one. I have had several, and the seal failed on all of them. Same for several friends - granted, the supplier replaced them, as if they were too used to doing so. Not good to find yourself without a watch once or twice per season though, although I suppose you could always run a two watch strategy...
I have tried many dinghy watches, some up to £75. I like a gadget as much as the next man, but I have settled on a cheap Casio Sea Pathfinder - £25 and indestructible.
Just for a change, rather than replace the battery after several years usage, I went for a more expensive 'treat' last time round. It lasted two days before I cracked the watch face. Back to the Casio...
No, I don't work for them. I just wish the big Ronstan / Optimum watch would get its seals sorted out.