I just noticed this post. I concur. The tenkara nipper and forceps are no different really to the standard ones available in most fly fishing shops (nippers and forceps). Same as Dr Slick and cheaper re-branded Chinese or Korean products. I have several pairs of each in several different brands, and they all weigh pretty much the same to within a gram.
i.e. effective products, and I use these all the time, but the tenkara branded ones don't seem to offer anything special over similar readily available units with different branding.