The original only had enough power capacity to charge your phone and tablets were left out in the cold.
Now The Mu comes in two more varieties the Mu Duo and
Both support USB 5V at 2.4A which is enough to charge your iPad. The Mu Tablet is designed to do just that (and it should also charge your iPhone faster), the Duo can charge two phones, though it can also charge a tablet if only one USB port is used.
Then with the side flaps open and the live/neutral pins rotated.
Aside from the small protrusions the Mu's will just slip into laptop bag without much danger of scratching anything which is MUCH better that a normal USB charger like the Apple standard one which is a normal UK plug with the electronics in the top and all pins protruding ready to scratch all your nice shiny Apple (or other) gear. Being thin and flat they'll also slip into a backpack pocket too.
The original Mu costs £15, with the Mu Tablet £20 and Mu Duo costing £22 from their on-line shop.
Definitely recommended if you want a higher power charger that will slide into a bag/backpack etc without scratching everything to pieces (or being bulky width ways).