A couple of revisions in Time Machine was just fine.

The UI was cute and fun if you wanted an older revision of a single file (especially since you could see previews of the file as you warped backwards).

However, importantly, the snapshots were available in Finder itself so you could browse through the files you wanted and retrieve them.

The worst feature of Time Machine is how it takes over every single display you have. Even though it only shows content on one screen, it feels the need to completely black out the others.