Looking at their website, they have restarted the Yasuhara Company. http://www.yasuhara.co.jp/index-e.html
I think that their products are innovative and it looks like they know what they are doing. There are only a few distributors, so getting service will be a huge issue, likely requiring that a lens be sent back to Japan for service. The built-in light in the Macro lens is handy.
The 5X Macro has adequate information about it. http://www.yasuhara.co.jp/nanoha/index-e.html
Their sample image taken with their fisheye huge a huge amount of purple fringing, not something that I'd want to show. The shadow of the photographer in the image does not look very professional either. http://www.yasuhara.co.jp/madoka/index-e.html
A company has to start at the bottom of the food chain, and there is a lot of low priced competition from Samyang, so they are trying to produce something that others do not make.