Is an adjustable razor worth it, or should I just buy a fixed one?

Adjustables like the Merkur Progress 500 let you dial blade exposure mild-to-aggressive on one razor, which reviewers say is useful if you shave both face and head, or if your beard density varies. Critics on r/wicked_edge note that many shavers end up settling on a single setting, in which case a well-matched fixed razor is simpler and often cheaper.