It's strange, but I actually feel like I am sleeping better. I noticed it the other night and didn't even think about how it has been that way since I installed the beta. I have been able to fall asleep faster and I am waking up feeling more rested. Maybe it's just a coincidence?
I'm not experiencing any lag or stutter getting to sleep! Sleep comes easy, just 8.4.1!
(in all seriousness, I do think this has been helpful. Of course, my wife says it would be just as helpful if I didn't use my iPad all evening, too...)