i've seen this question come up from time to time and the same two answers generally are given:

• estimated power is not all that bad but...
• estimated power is crap because...

regardless of the answer my question is how do you know? i have my own doubts about their estimated power which, ironically, is mostly due to the reasons that both camps give. the only way i can see to get an honest answer is to upload a ride without power data and compare with the same ride containing power data. has anyone done that? it falls on someone with a power meter to do this. if i had one i'd give it a whirl just to see.