I don't claim to be knowledgeable with OCaml, but I use it on and off since a couple of years and wrote about my thoughts when it was first released[0]. tl;dr: don't like the syntax, for the most part it's worse than OCaml itself. The rest is alright and helps the OCaml ecosystem as well, the focus on better tooling is good.
I know it's dumb that the thing holding me back from OCaml is the syntax, but after giving up on an Om project I've come to accept js will always be the greatest common denominator.
As I recall, Reason is the current project of React originator Jordan Walke and React contributor Cheng Lou. I wouldn't be at all surprised to see a Facebook project emerge that allows you to author React apps in Reason with Bucklescript.
