Sometimes I'll go 2 years without upgrading. Certainly the difference every 2 years is enough to warrant it. It seems there's a new sensor for measuring a new d

Sometimes I'll go 2 years without upgrading. Certainly the difference every 2 years is enough to warrant it. It seems there's a new sensor for measuring a new dimension at least every 2 years. But I also put these things through the wringer (lots of physical activity, including salt water ocean adventures). I wear them 24/7, so it's literally the thing I use most in the world.