I lived in Japan a bit over 10 years, so if you call that long-term, then perhaps I qualify. I was living near Osaka - yes I purchased a house, and I lost 50% on it. You're right, the economy is bad.

The experience was great, I wouldn't trade it for anything. Of course there were some bad bumps in the road, especially near the end of the stay. I think 3 years would have been perfect, but beyond that I really got tired of it. But it sure is a broadening experience. Make the most of it but don't get trapped into it - either into Japan or into a dead-end career. Don't lose your key to the exit door.