One concerning aspect of the Doyeah tights was the fact that they are one size ('free size', the manufacturer calls it), but I am pleased to report that they fit me fine - I'm 6ft, 34" waist and 32" inside leg (in other words, towards the upper end of their stated size range), and I would say there is still plenty of room in them for bigger guys than me! The thing that struck me about them when putting them on for the first time, is how stretchy they are - they seem to just go on and on, and they are REALLY comfy - the fabric has an almost velvety feel to it. On the 0858 (the 80 den model), the fabric is sort of semi-opaque, a bit like the ComfiLon 569's - a sort of heavy sheer, but not opaque; it's difficult to describe in words. The fly opening on this model is quite similar to that on the ComfiLon 549's. The beige colour is really good and matched my (rather pale European) skin tone really well. They are nice and warm - it is hovering around 0 degrees here today. Build quality is superb; the seams are excellent (flat seams in the brief, conventional in the toes), and the attention to detail is really spot-on - even the packaging is really high quality. I can't yet comment on their durability, but they don't feel at all fragile - time will tell!
After having lived with the Doyeah's for a while now, I can report that they have undergone a fair few wash/wear cycles with no ill effects that I can detect - they seem as good as new!
Nothing to complain about here - a superb product, especially considering the low price!
Doyeah 0858 80D Men's Tights