My Tarmac bike used a Quarq power meter, so when I built up a 2014 Cervelo R3 frame I added this Quarq DZERO power meter and it just works. There's a free App that lets you calibrate and see the battery level. A power meter helps me keep a sustainable pace on my weekly century ride each Saturday.
I got this to replace my Garmin Vector 2 pedals. They work, but the Quarq is a simpler, more user friendly power meter. Once it is installed it is easy to set up and use, and it always seems to work without any drama. I have come to depend on the power meter to make sure I am training in the right zones. It also helps me pace myself up hard climbs and during races.
This is my first power measurement device and I've been very impressed with how easy it is to use. I connected it to my Garmin and it has worked flawlessly for the past year. I find it particularly useful for long hard rides to optimize my pace without burning myself out.