Overall, I don't like them so far. I got mine delivered this morning, and they pair alright as others have said, but the double-tap thing just isn't reliable for either Siri or Play/Pause or answer/end call usage.
For example, I'm often left trying to answer a phone call double-tapping, then double-tapping again, and double-tapping again, and double-tapping ...you get the idea. By the time it may/may not finally work, I've often missed the call or it's gone to answerphone!
Same with Siri or play/pause... double-tape, double-tap, double-tap, double-tap...aaargh?!?!?!? It's just too finicky to make them useful for everyday usage.
The worst thing though, is that I really also don't like that when I tap on them, my eardrum feels like someone is banging on my ear each time. This is surely a personal tolerance thing, but for me, I hate the banging effect on my eardrums every time I need to do something — it's more irritating than anything.
Attractive looking though they may be, as they do sit in the ear well, and sound reasonably ok for commuting usage (when you want to hear stuff going on around you), if tap is unreliable and annoys my ears when doing it, these aren't going to cut it regardless, at any price.
PS: Anyone keeping them, I'd recommend getting a back-of-neck chain of some kind, as I can see loss and/or, even worse, thief snatches from people's ears(!) possibly being a 'thing'.