I've got a Mu plug. I'm quite impressed by it; while it probably is less robust than a regular plug, my gut feeling is you'd have to hit it side-on with a hamme

I've got a Mu plug. I'm quite impressed by it; while it probably is less robust than a regular plug, my gut feeling is you'd have to hit it side-on with a hammer to stand a chance of breaking it while it was in a socket. The fold-out shield around the pins is reinforced and angled to deflect side-impacts. A USB cable seated in it pulls out long before it can exert enough leverage or force to pull the Mu's pins out of a socket. The rotating pin arrangement feels solidly built. While I think it's a bit gimmicky at this point (and: £25 for a USB charger?!?) it's better designed than a lot of the crappy kit you see out there, and shows promise for something better to come.