ok, just got the pro member deal and went in to watch the MTS videos, which have great info and are well produced.
half way through one of the videos i clicked to check the comments and the video reset and had to rebuffer, which sucks. this can be avoided by using an ajax call to load the video comments etc. this should be pretty easy to implement. something that might be tougher to implement depending on your tech staff would be links to the timecode from the index on right right hand side and have it buffer from that marker, making it easier to skip through the chapters to review the parts that you want.
thanks for providing this resource.