The AnyWatt comes in three versions: one for square-headed chargers, like those found on Lenovo laptops; one for more traditional barrel plugs; and perhaps most surprising, one for Apple’s MagSafe 2 adapter.
I really don't see the amazement at this product, it's just an adapter. Sure, the automatic voltage adjustment is nice. But if you have a Mac, are you really going to ask a Lenovo user for their charger?
Just bring your own.