Immediately after getting them I used them for a half marathon, and had no issues at all. I cant believe the sound on these. Wide soundstage but not as wide as the HD598 I own but that is expected because those are full sized open backs. I had it for a few months and it has not separated from the buds case. I love my Chaco sandals, and I was so excited to try these. I have plantar fasciitis and need to stretch my calves daily. Takes up no room. Decent shoe rack for the price. But for truly wireless earbuds that are utility players across all the categories, these are my favorite by far. youll quickly get used to inserting it, and spinning it back about a quarter turn to lock it in place.