To top it off, I just got a powermeter specifically to get better correlation with my outdoor rides and my indoor power efforts.

Turns out that there is NO DIFFERENCE in the quality of my workouts with TR with the powermeter than without it (using virtualpower). Yes, the virtualpower numbers were pretty off compared to the powermeter in absolute values, but the absolute number doesn't really matter - as long as the computed power based on wheelspeed is consistent, your workout quality is the same. My workouts with virtualpower were every bit as good as my workouts with the powermeter.

TR works well enough that I'd say that unless you plan on racing or tracking your outdoor workouts with power, just skip the powermeter altogether and rely on TR's virtualpower, given that a low-end new powermeter will set you back $800 minimum. You won't lose anything in the quality of your workouts on TR.

It's good enough that I feel that it's basically my power-based cycling coach, and a pretty darn good one at that. Also given the choice between having my powertap or TR, I'd take TR in a heartbeat. The powertap is only one part of a total training program, whereas TR is the entire enchilada. No question from me there which would get me better if I were using it for the whole year.