Are you going to be using them indoors, outdoors, while working out?
If you're going to get a lot of use out of them, make sure they will stay in your ears, try and see if you can test a pair. Some people I know never use them because they are always falling out and are afraid of losing them. You can buy the wire attachment or simply just buy a different bluetooth set that already comes with the wire that you can wrap around your neck.
Minor detail, but they look kinda stupid on anyone who wears them in public. For a company that cares a lot about looks they sure didn't consider fashion