If you go by looks alone - they sure don't look like low-end drums to me! I suppose the metal would be what is in question - as the design looks very Tama.
In a perfect world, the drums built in your own home country would be found to be the best. At the same time, as evident in my MIJ enthusiasm, I recognize that even 50 years ago it was (becoming) a world economy and thus, frankly I don't care where it's made. If it's good, it's good - no matter what reputation XY company has from XY country.
Not trying to politicize this thread, just saying - that though they may be Taiwanese does not automatically mean they aren't any good - especially since they appear to be results largely of Tama engineering - which all know is good quality, at least in that era, and even specifically of that drum type (snare).
Of course to a certain degree here - I am preaching to the choir as most of us here appreciate all/any drums no matter where they are made. Now if all Taiwan manufacturers always used cheap materials (and if this is clearly documented) then that would be a different story - but I know of no specific country where all the drum manufacturers use cheap materials across the board.
Again, not trying to politicize this thread - just saying that where something is made and even what name it has onn it never stops me from fully investigating drums/cymbals for what I find them to be once in my hands. One case in point is a thread over at DFO concerning Cambers. I was quite involved in that discussion and am certainly grateful that I read that thread - as I took a chance and snagged up a pair of HHs - and my ol' my! Are those ever some GREAT recording hats!