The two watches also tout more more accurate heart rate monitoring that uses multi-layer optical sensing, electrodes and accelerometers to get both faster and more accurate heartbeat readings. Spring for the Vantage V and you'll also get running power data (a first on the wrist, Polar said) that helps you pour more work into every stride.

Polar is taking pre-orders for the wristwear today, although you may need to brace your wallet for impact depending on what you're buying. The more mainstream Vantage M sells for $280, but the Vantage V will set you back $500 ($550 with an external heart rate monitor). The V's cost is easier to swallow if you're a serious competitor -- just know that it's likely overkill if you aren't chasing a place on the podium.