Yes.
Stableheapbtreemap has been in production use with canDB for over a year and Map v9 has been remarkably stable for over a year as well. I haven’t touched a base collection in years as their allocation performance tops out quickly and you soon hit O(n) allocation that take your entire round to execute and eventually even deterministic time slicing won’t help you.
You can see here in some of @ZhenyaUsenko initial benchmarks that Map was sometimes like 29x better at certain operations. Map v8.0.0, it's finally here
…and this was before the v9 improvements.