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Thought you might be the man to know! Your thoughts might be what I had picked up on. My view is (having just had a whole house rewired at significant cost!) is that I haven't gone with them. I have instead used multi-bank chargers so 4xUSB from one plug socket, means I am not stuck having to change them in the future. We went Hager everywhere.
Sam_w-
That's what I'm doing, I use an xtar model, 6 way and stays cool but can provide quite a few amps to all the usb sockets simultaneously. Of course it looks neat to have them on the sockets and non technical people love them but there are some pretty obvious design problems building safety and a decent transformer into the back of a plug socket. I assume most of them will be consuming current constantly too.
Airhead
The regulations are falling back on the coverall health and safety aspects to ensure these sockets are not dangerously installed. There are a few eyebrows being raised by experienced electrical system designers about the added risks of the transformers etc. but the regs have yet to include a special mention for these sockets. Try to buy a reputable brand like MK as they are likely to be more concerned about safety and isolation of LV from ELV currents.
The great thing about a plugin charger is the fuse, transportability and ease of replacement if it breaks, the fuse helps to make safety easier to ensure. In the future your phone could be intermittently tripping the electrics in half your house because your charging pad is occasionally overheating, little problems like that will be a good earner!