Summary: I really like these a lot, I am very active and ride my bike a lot as well. The last thing I want to worry about are my ear buds falling out of my ear. They fit great and they let my ear breath. I've had others that don't let them breath and after a period of time my ears will get moisture in them. As far as sound good as well, I listen to both music and audio book and they do a great job for both.
Summary: I've owned these earphones for approximately 2 months. I use them every day. I wear them at night to listen to relaxing music so I can sleep. They're very comfortable unless I turn my head to either side while sleeping. No earphones are going to be comfortable if you're lying on them. I also used these earphones when I exercise. I exercise 2-3 times per week for 2-3 hours at the time. I have hyperhidrosis, which I find disgusting.