Robert said in an interview recently that the albums recorded at Caribou were among his favorites. The Quadio box is the best reissue of them IMHO, a very special time in terms of sound quality and creativity. I wrote about the quad mixes of VI and VII already, and think these are all really great albums. I've been enjoying this set since it came out and happy for school breaks so I can sit down and enjoy them again! (Sadly, XI isn't included in this box because it was never mixed in quad.)
As far as I know, all except VI were mixed on a Neve console.