My interval screen has 10s power, lap time, HR and cadence. For racing, I use my JRA screen, which has speed, distance, lap time, time of day and HR. I don't look at power data while racing. The HR data isn't a problem for me. It's a pretty small field on the display, so it's not distracting, I have to actually look for it. And it doesn't psych me out. It's more something else to check RPE against and it can be a good reminder to take it a little easier and rest during non-critical race moments. If I were to look down while bridging a gap or attacking on a climb and see 190, well, duh. NBD. If I think I'm chilling in the bunch and I look down and see 190, chances are I'm being a little more eager than I think. Contrariwise, it was interesting to do a crit last weekend and see my HR spending lots of time in the 160s and even 150s. The fitness implications are good. Power, I save for analyzing later.