GB:
While I don't use them; I know quite a few folks including a professional tyer who swear by them.
I try REAL hard to keep my hook inventory down to a few styles and manufacturers and I started with Daiichi & Tiemco so I stuck with them which is the ONLY reason I don't use Dai Riki.
I also heard a story which may be just that, a story; that Dai Riki and Daiichi are made in the same factory in Japan.