Hey, it's not nit-picking if someones wrong in the Internet... Seriously though, many if not all Polars are waterproof. As in, go ahead and swim with one. That's why they require you to take it to an authorized service point for battery replacement (NOT to the factory). They can make sure it's properly re-sealed after they change the battery.

Before I went all GPS I had several Sigmas, wired and wireless. Very solid computers and the dual bike mount was useful. In our winter I preferred wired units. I keep the winter bike outside for long periods at a time, and cold weather killed the batteries in the wireless transponder. Sigmas were excellent for cycling, but GPS works better for me in multi-sport use (mainly XC skiing and paddling besides cycling, in my case).

--J