I wasn't really familiar with Animals as it never really resonated with me, for whatever reason, upon its' release. I never owned it but heard it a few times at a friends house back in the day.
This bluray release has changed that. Sonically, it sounds great. The 5.1 mix, though not as aggresive as I may have liked still works well. I'm very pleased with my purchase.
Regarding the sleeve the disc sits in. I, like others, am not a fan. It was solved by scanning the outside and resizing to fit a bluray shell/holder.
I did the same for a friend who purchased the bluray.