I brought my K3 with me to London on biz trip in Oct. My customer was really amazed when she saw me updating my facebook status when we were doing the tourist thing together ... e.g. waiting like a couple of idiots for 1 hr+ outside Buckingham Palace just to see the change of guard

, had a cruise on sunny and breezy Thames River and me checking the same day's discounted musical ticket selling at Leicester Square. Needless to say, my friends back home (i.e. Hong Kong) were equally amazed when they learned I could have almost real time report on what I was up to in London.
For me the speed is acceptable (that's why Amazon called it experimental and you just need to set the right expectation), so far it did its job and is totally free anywhere I go, honestly I can't ask for anything more.

P.S. I have the US version