I am a sucker for a slick new tool to make working on the bike more enjoyable. I got the folding hex key set from Garret Wade. A nice set of folding allen keys from 1.5-6mm.
It is handy to have around as its just a regular set of folding allen keys that happens to ratchet. You’ll probably not ratchet to much stuff with it. Its handy on seat bolts, crank bolts and…. well not that much else on the bike. It came in incredibly handy when putting together some flat pack furniture from ikea though!
For $14 its not bad to have in your tool kit, but its not essential.