The best part is a bunch of stackable spacer-plates between case and lid that let you put various stack-ups of expansion boards and still get the lid on.
My biggest complaints would be the lack of good mechanical drawings (although that's true of I think every single case I've looked at), and that the slots for LCD/camera ribbons are default-open, when they could have been a snap-away seam or something since I'm not convinced most Pis have them attached anyway.
This new one looks interesting, but the curvy bits will be a nightmare to put UI controls (buttons, etc) in, and (probably) can't easily be swapped for laser-cut replacements. Maybe 3d-printed ones? Although I don't know how durable a 1-2mm thick panel would be with most hobby technologies, and how long htey'd take to make.