I have the Eno streaming system and the latest version of the USB cable in my system playing 24x7 for few days, I think about 150 hrs. Initially I put all of them together as I didn't want to burn them separately and waste time.
Its probably too early to tell but listening in between the burning period, I felt there are lots of up and down - initially I liked what it did but after couple of hrs of playing time, I just couldn't bear it. So far after 100hrs, it looks like they are settling down and I am liking what I am hearing so far. I can't tell which one effected the most. I don't know if it will change further but after 200 hrs (which I hope is sufficient ?) I plan to put one at a time and evaluate.