They are good; they do not fall out my ears and I have posted about the experience of them over several weeks ago. If they don't fit your ears well, just get a pair of Galaxy Buds+ since that's your best bet until the Galaxy Buds 2 release in August.
I got mine a couple days ago and am having trouble fitting them. They start to feel loose after a while and I find my self refitting them every 5 mins. Every time I move my cheekbones they get loose. I'm afraid of losing them when I go for a run. They have great sound quality. Anyone have any tips on how to keep them from getting loose? Maybe there are some third party foam tips that are better because the foam tips that come with the pro buds are trash.