Is anyone actually utilising a recent version of PostgreSQL for full-text searching beyond a hobby project? How do you find the speed and accuracy versus Elasticsearch?

I've also used Elasticsearch, and I reckon that's pretty damn amazing.

Anyone wanting more in-depth information should read or watch this FTS presentation from last year. It's by some of the people who has done a lot of work on the implementation, and talks about 9.6 improvements, current problems, and things we might expect to see in version 10. https://www.pgcon.org/2016/schedule/events/926.en.html

There's also some previous presentations on the same topic which are interesting. You can see the RUM index (which has faster ranking here): https://github.com/postgrespro/rum