I just got both a plain edge and serrated edge Tenacious. I know that the thumb test is not the best measure of sharpness, but both blades feel at least as sharp, if not sharper than a Delica I have to compare them to. The polish on the blade is not as high as the Delica, but they are full flat ground and swing open very smoothly, easier than the Delica in fact. They are a bit bigger though, so I may have to add a Persistence to the collection.
Yes, they are made in China but don't ignore these knives because of that. They are very well made.