I also purchased a NUC7PJYH back in November for the purpose of hardware transcoding. My decision was largely based on the same video that Will_M posted a link to. The NUC I purchased has the J5005 processor. In the most recent version of the Plex Media Server the blockiness that occurred in the beginning is gone for me. However playback quality frequently pauses and has pixel artifacts around motion in the video. The linked video review does not mention the pixelated playback so it worked at some point. Indeed the workaround of deleting the new version of the new iHD driver as mentioned here seems to work.
