Anyone tried the new IGC/MPS garbage collector branch?

I've seen mailing list posts saying it improves latency, but it seems hard to measure (experienced latency being different from what micro-benchmarks show). I'm considering trying, but what's the stability like?

References:

https://git.savannah.gnu.org/cgit/emacs.git/tree/README-IGC?h=feature/igc (I guess igc means "incremental (generational) garbage collection")

MPS is Ravenbrook's Memory Pool System / https://github.com/Ravenbrook/mps (I guess the igc branch adds this library as a dependency)