I love darcs! Somehow its interface just vibes with me. It is interactive by default, and the commands like “record”, “rollback”, etc, are somehow intuitive. Darcs also tried to put more semantic content in the patches, like file operations or search replace parches.

It is always satisfying to rename something, then merge in some work where someone used the old variable name in the meanwhile, and the merge would go through automatically applying the rename!