I have a quark riken and a powertap g3. Both measure about the same. I am a pretty useless when it comes to drafting. Most of my racing i pull then i can't sprint. Still have managed to take a few top 5 and top 10. At one point in time my 1 min power was 700watts and i made the roswell historic crit an averaged 299 for 40 min. Came in mid pack after a pile up on the last lap.