I've used it for several years and done a lot with it. Most of the niggles have been ironed out over time, though Android does tend to lag behind with things a little.

Most recently they introduced Hyperloop (not that one!) which allows direct access to native API's, use of cocoapods etc directly from JS. That would be fantastic if it didn't require a team licence of $1200/seat upfront to even use. With React Native taking off and Nativescript also offering native API access, I can only see it withering behind the massive paywall now which is a shame.

Personally, most of my new projects will now be React Native as I'm confident it'll be around and well supported for longer.