I made JavaFX app for my company. It is in the gambling space. Used to display jackpot related stuff, winners, current jackpots, promotions, etc. It is deployed to every betting shop (around 600 of them). It also interacts with central server and gambling machines.

I started with swing then shortly thereafter switched to JavaFX and it was a joy to use it for this usecase. Really easy to make what we needed in small amount of code and it is performing well and is really stable (runs 24h/7 without problems)