I flew last month wearing one, and had absolutely no problems.
As usual (I put it down to an under-wired bra), I was called aside for a pat-down after the scanning arch. I expected a "little chat" when the sensor was felt.
It was certainly felt, as the lady patted it, but no reaction. No questions or even eye contact to see if I was nervy at all. Waved through.
I scanned at will for the duration of the 9 hours or so of the long haul. No issues. I noticed no shift in accuracy or otherwise.
My only comment will be if you are in a different time zone when you land you will have to consider if you change the reader time as otherwise your reports will be a bit skewed. I must admit, I left mine for the remaining time of the sensor, rather than changing.
Enjoy.