I use one (size 2) daily, and heat it / rinse the filter paper with the switch up. Less wasted water and gets it up to temp quickly. I do not like heating plastics. I’d definitely recommend the switch.

I’m an avid paddler/wind sports/surfer, so having good water resistance, cellular connection for emergencies, at least 4+ hours of GPS tracking battery life, and good GPS are requirements. AFAIK only the Apple Watch Ultra ticks all those boxes. I used to use Garmin’s but the lack of cellular made me switch. If anyone has other options, I’m open to them.