I'm a big fan of Clojure and React, but haven't used Clojurescript or Reagent. I find React pretty easy to grok so I'd be interested in how you think Reagent makes it easier to use.
Reagent means you don't have to grok Reagent at all. If you know how Clojure atoms work, how to use Hiccup-style templates, and understand that all templates ('components') that dereference a Reagent atom will be automatically updated when the atom is, then you know how to use Reagent.
I think you meant "grok React". But yes, Reagent is super-nice. I'm surprised much of the community has gone for Om, since Reagent strikes me as much cleaner 98% of the time. Om maps closely to React, when most of the time it doesn't have to.