The stability is okay and given the ability to go back to a previous build if something breaks it is very usable. But I would say that it’s definitively not comparable to a stable branch.
Especially annoying to me is that if something breaks, it takes some time to be fixed. It happened multiple times to me that something broke and I couldn’t rebuild my system (and e.g. add new packages) for several days - until the fix (which could be a git revert or a oneliner) was through hydra. (maybe it would make sense to think about a way to add quickfixes faster to unstable). In my eyes it’s still quite far from a stable release, I see it more like a testing branch 
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