I signed up for a trial membership a couple years ago and used it to reasonably good effect (would have been US or Japan, not sure). I've since signed up properly and haven't yet found anyone else that has the global reach/ capability they do.

Sadly service can be erratic and at times really not at the levels that you'd expect, but when they do manage to get their act together they can be extremely useful.

They also appear to vary hugely by office - for example, the South African team are really proactive and pretty impressive, the London team can go the extra mile or might just completely mess up, whereas the US West Coast offices appear to have some real issues.