I occasionally check in on the forum over at ibike, y'know, just to keep 'em honest and all. I noticed some extremely repeatable peculiarities with the ibike during the process of updating my power meter review earlier this year...and when I stumbled across this vibration comment by the ibike founder:
...I reckon I'm left wondering...you sure about that, John?
Based on my experience, the fellow that started that thread seems to be pretty observant...y'know, I think tweaking stuff after the fact (hey, John, isn't "in a/the box"...stolen from the Chung acolytes?) pretty much seems like a bad idea when it comes to measuring and reporting power.