The Region 1 Criterion release (NTSC, 142:50) includes the following features:
Reviews of the Criterion speak highly of the picture quality, citing an average video bitrate of 6.9Mb/s. The documentaries look rather interesting to me.
The Region 2 disc by BFI (PAL, 137:00) has comparable picture quality to ours and includes some biographies and an introduction by Alex Cox.
Our local release is good, but obviously keen Kurosawa fans ought to go for the more expensive Criterion.