Biggest problem with the Japanese 101s is parts availability. I have a 12 and a .410, and they are pretty nice guns. The higher grade 101s were really nice,
No, the biggest problem w/ 101's is that they kick the snot outta people - a personally verified and justifiably widespread reputation. I had one for a couple days. Gave my wife a black eye. When I admonished her for poor form she told me GFY and YOU shoot it. So I did (shoot it anyway) and after the second shot I put it in the rack with a FS sign on it. The gent that bought it a few minutes later - it was a reallly good price - was rather heavyset and loved the gun.
At any rate, you're on your own w/a 101.