I?ve yet to experience any dropouts or issues syncing the buds with each other. Highly recommended for 2 reasons, and with explanations of its intended use: 1) My first version of this cooler/speaker combo clearly had an issue with the speaker, but because I bought it last fall, and didnt use it till this spring, I missed the window of opportunity to return/exchange. First of all, I was immediately disappointed with these because I wear a size 7 shoe and I ordered the 6. Theyre a durable strength of rubber, dont interfere with the actual placement into the ear, and most of all I no longer worry about losing my $$$ investment just because they fell out of my ears. Excellent fit, size wise. I started buying them when the Walkstar was the model that they advertised as giving you improved tone in your tushy and legs. highly recommend this slippers I really think if youre interested in minimal footwear, this is a great place to start. If I wanted to leave input I would. At times, I have to double click to pause or answer a call.