We've been using mise since it was called rtx at $DAYJOB, and it's caused many a headache (mostly around upgrades/backcompat/etc.). We use it both on dev machines and in CI. In spite of that, it’s decent at what it does, and I wouldn’t soon replace it with individual version managers, given that we have similar needs.

However…more than once we've seen language runtimes that used to be available exclusively via plug-ins be migrated to be internal to mise, which broke everyone's setups in strange and hilarious ways, and caused countless hours of debugging.

Less bad overall than using individual runtime version managers for sure. But the next time mise costs us a bunch of hours fixing multiple engineers' setups, I intend to find another solution, even if that means writing my own. It’s burned us nearly one too many times.