I don't know if the cause was slow mirrors, slow processors, slow color wheels, or some combination, but first generation DLPs definitely had a fast motion blur problem. I didn't find the problem anywhere near as bad as it is on a slow-refresh LCD monitor, but it was there. It was particularly noticeable on the DLP-based RPTVs (I watched a lot of HDTV football demos on those units). In the limited time I had with the Samsung DLP RPTVs, I didn't notice this problem at all, nor have I seen it on fast color wheel front projectors.

-avi