It has a few weird glitches that happen every couple of days, and I haven't been able to find a way to 100% stop non-English languages from showing up. Every other day my feed will get filled up with posts in Dutch or German or something, I'll go through block communities and try to keep them out (I just can't read what they say, so I don't care to see it). I tried changing my language in the settings, but that doesn't seem to have stopped it. That and random problems with being logged in seem to affect Memmy on iOS. Otherwise, I'm liking it so far.
Hopefully the momentum continues and the community builds. I was worried about finding a barren wasteland after leaving Reddit, but it seems to be doing well so far.