Without divulging anything, I can safely say it's responsible for at least 32 apps that made it in the Google Play Top 100 games last year, so it's doing pretty good.
For anyone else that wants to focus on iOS where they will make the most money but not compromise on Android and provide it with the same experience without having to rewrite everything, it's working great. I will say that if you are building a game it works out of the box today better but we have a lot of people using in ways we could never imagined.
The newly rewritten UIKit support is coming soon which will make it a viable solution for anyone that wants a single push button solution for all kinds of apps. For a few users, they choose to use the native UI on Android and bind that to their Objective-C/C++ backends with Apportable. There are a lot of options with Apportable.