Koken rachets and sockets

Hello, has anyone used Koken (japaneese) rachets and sockets? I recently purchased a set of 1/4 inch very very short metric sockets for a specific task. Used two of the MM sockets in a tight location, no issues. I bought them for their short size, worked out perfect…

I do not own any but I have used them in the past, they were excellent quality in my opinion.

Ko-Ken seems to have a good reputation - and the few pieces of theirs that I’ve seen seem very solid. Not that I would expect less from a Japanese brand.

They seem to have some innovative designs like nut gripper sockets:

Double Universal Joints:

and other oddballs like these: