I am an audio guy, and I'm curious as to Hairy Hen's opinion as well.

I owned the blu ray and spent a little time with it in 2011 and 2012. I don't remember any drastic changes other than in pure quality.

The audio on the DVDs is subtly irritating. I don't always hear something obviously wrong with it, but almost invariably I can only get through about 30 minutes without being on-edge and wanting to turn it off and do something else.

The Blu Ray audio, on the other hand, at least the DTS Master Audio, sounded expansive and completely free of the glare-y harshness of the DVD.