After many years using a powertap hub, I got the P1 Pedals so that I could more easily swap them between bikes. They have been great thus far.
It was super easy to pair them to the Kickr Elemnt, with two small caveats:
* The first time I tried, it only paired to one pedal (which I realized b/c my watt readings were roughly half what I thought they should have been). I tried again and it worked no problem
* 2nd issue is more of a Kickr Elemnt thing -- the Elemnt didn't have an option to set the crank length for my bike. Instead, I downloaded the Powertap App and used it to change the crank length from the factory 172.5mm to my 175mm.
Since then, they have worked flawlessly and I'm a fan.