When I got a new laptop this summer I researched what chargers were out there, as I was fed up with carrying the normal assortment of cables and chargers. I settled for another GaN charger - the Innergie Powergear 60c[0] which is a very decent size for 60w and not having a mains lead built into it (still very common on non-mac chargers) makes it a lot more compact.
I travel a lot, often with more than one laptop, so now I'm very happy I can charge all my electronics with this one charger and also with the changeable country tips it's more compact than a travel adaptor.
The only downside I've had with it is the US power tip got bent the first time I used it - I contacted Innergie to see if I could get a replacement, but they never got back to me.
[0] http://www.myinnergie.com/sg/product/136