I am planning to buy a HPX-250 in the near future, but am concerned about the switch by Panasonic to a rolling shutter. In the past, these have been at least a mild problem when recording high-speed motion. I do a fair amount of auto and bicycle race recording, and wonder if this will be a problem. When someone gets one of these cameras and can look frame-by-frame at some type of fast motion, I would be greatly interested to hear their impressions.