If you're afraid that this might contain mostly unlistenable outtakes from the seminal albums, don't worry. The quality of material on this 3CD box set is astonishing. The tracks sound incredibly fresh. In my opinion, almost everything on here (with the exception of the superflous 'The Agreement' and perhaps one other track) is intriguing and highly enjoyable to listen to. We've got the fifteen minute (or so) wig-out of 'Graublau'. We've got out and out funkiness on 'Barnacles'. You can hear the beginnings of tracks like 'Vernal Equinox' from Landed (it appears here as 'Midnight Men'). We are also offered a selection of live versions of tracks which veer in really wonderful ways from the original. There are stunning vocal performances from both Mooney and Suzuki, some of which stand up incredibly well to the tracks we know from the albums.
I'm a big Can fan but I think that there is some really accessible (and fun) material on here which would serve as a great introduction to a newcomer. It's also obviously a fascinating listen for an aficionado. Recommended.