TQ,
I just moved to Japan to start my postdoc. I lived in UK for 20 years before that. I would say go for it, depending of the conditions of the postdoc. Are you going to be paid reasonably? If so, give it a shot!
Moving abroad is always a nice experience. Initially I didnt feel like moving away, but now that Im here I am happy that I did. I can always go back to what I was doing before, but at least for two years I am guaranteed a nice salary among other bonuses.