I only have a few japanese tools;
KTC extra long double spanner - Very much an 'industrial' finish but the quality is great and fits tight to the fastener.
Vessel attack impact driver - the finish is flawless, it hits hard and i've never had an issue with it.
Koken spinner handle - much better than anything else i've used, thicker and with a perfect finish, sockets fit tight.
10mm & 13mm koken 1/4" long swivel extension sockets, bought after seeing them on amazon.jp. They come in very handy.
Tone extra long 3/8 ratchet. Finish is great, very comfortable, the head is quite small and it fits in most places.
Overall Japanese tools are fantastic if you buy for a decent enough brand. I've got a 13mm nepros spanner on order, i'll see how that is. They're stuff is meant to be like jewels rather than tools.