I guess the point of this is.... I'm really good about staying dead on my pacing during TT's, and use the SRM for that. I don't really use it so much in RR's or Crits, but I also don't ever really look at it then. Because of that, there's no reason to NOT put it on the bike. The weight penalty is almost nothing (and i'd be using the cranks anyways), and it's very useful data for the above posted reason.