The bracket for attachment to the ear do not appear too unstable. But even better is the alternative attachment means of a holder in the ear. If it does not look so, so but considers this very well and, moreover, is hardly noticeable. Another advantage is that you can wear a (sun) glasses even because there is no clip on the ear interfere.
It is also positive that the complete outside (black area) is the answer button, which ensures easy accessibility of these. The volume control is within easy reach.