Just got the 8.0 update. For those that use PS Vue, the update to it is significant. Feels very similar to the PS4 version, and didn't lag much. Granted I only used it for 10 minutes or so but my initial impressions are positive.
As far as 8.0 itself, I haven't really had a chance to watch a lot of stuff yet so no real impressions of it.
Denon AVR-S930H Receiver
Philips BDP7502 UHD Bluray Player
Apple TV 4K - 32GB