Ok - so my 5th MBP arrived yesterday 9C85 display... no stagelight effect, but within 5 hrs of use, it started to flicker.
It's going back. I have decided to give the 17" machine a try as there seems to be a firmware update that address the issue (according to the guy I spoke with at Apple). That said, the 17" machine does seem to have similar problems (
http://discussions.apple.com/thread.jspa?messageID=9293822 ) which implies it's something more generic rather than 15" only.
One interesting aside... this might be "Apple's Greenest MacBook ever" but the number of airmiles clocked up going back and forth to China also makes it one of the most well travelled... can I offset it's carbon footprint? 🙂