I drove a version of this for a fairly long time, remembering downloading it from GitHub page, not from the customizer. It's not a bad font by any means. I enjoyed Iosevka a lot while I used it.
But, after using Berkeley Mono for three minutes, I switched to it everywhere in a week or so, and never looked back, or looked anywhere else, to be precise.
Yes, it's not free, and yes it's opinionated. I can say that my opinions align with that font pretty much. It's one of the things which I cherish like an expensive hand tool which really does its job very well and makes you happy with its presence.
Funny enough I paid for Berkeley Mono but its italic is just not up to it (and particularly not to the price). Iosevka Mono has very nice glyphs but just way too narrow for my taste. JetBrains Mono, IBM Plex Mono (or Lilex) or Roboto Mono just seem to work much better for my tired eyes !
Here's an Iosevka config that mimics Berkeley Mono for those who don't want to or can't pay money for it. https://ahatem.github.io/IoskeleyMono/