The sound quality is great and outgoing audio is great as well. The actual elastic in the wide band at the top is only about an inch wide and it?s not too tight. This produced a very loud static/ feedback like noise. Hubby said after 5 minutes his abs felt a burn. Truly, this thing has given me all the functionality Id get in an expensive gym elsewhere. My concern comes in the round bands that go over the corners of the phone, if they have any twist in them, riding vibrations will cause them to roll off the corner of the phone, I had this happen it was a bit heart stopping to think only a small silicon strap was keeping me from an expensive repair bill. I mean literally - they are ok. Arrived fully charged. I?ll update this review if things change. The only thing (it?s not a bad thing) is that whenever I wear them, I feel like Lizzie McGuire because the soles are so high ahahahahah