I've got a US and a Jap one at the moment, and have had another US one in the past.
The Jap one is the best made - both US ones had little 'faults' (tubes not lining up, etc)...but for some reason the US ones fetch more money, however I would say that is changing now in the UK with Jap/Tai catching up as people realise that it's only the American's who give a shite where it was made.