It's hard to say how they are compared with knobs from Tayda. There are several suppliers in China and Taiwan, don't know what tayda is selling. It must be the same good quality. Sure it's simple knobs for everyday using, very popular among diy guitar stompbox cloners and various "boutique" pedal makers.
You can try to purchase some of the davies clones at Banzai - they have Taiwan knobs (at least I've seen 1900 series). But please note that I have no neg feedbacks about these knobs.
To my taste - very good value for money.
Thank you for enquiry!