Just received one of these today! Seems to work pretty well - you know when you've positioned it correctly because you get audio feedback. Seems to charge OK, looking at the battery graph.
On the back of the box in the specs, it says "conversion 72%". I guess that means you lose 28% of its charging potential via wireless, compared to wired?
Still, it feels fast, and does its job.
---------- Post added at 05:52 PM ---------- Previous post was at 05:50 PM ----------
Looks the same, though the one referenced in the first post comes with a 15cm and a 150cm USB-micro USB cables. It looks like you just get the Qi disc here.