Just turned up from that China after a long wait. I was scouring ebay for hubs with twin threads and non-QR axles. It's for a tandem project that otherwise is using mostly stuff in my parts bin. The twin threads are so I can use a freewheel from stock on one side and mount a hub brake on the other.
When these appeared for the stupidly low price of 17.52 the pair plus 2.05 postage I thought I'd take a punt on them. At that price even if they turn out to be useless, it's not going to break the bank. Joytech is a brand-name that appears on pricier stuff too and allegedly is turned out by the same factory.
Initial impressions are that the one-piece hub body is nicely machined and the finish is good. The threads are cleanly cut with no burrs. However, the axles are stiff to the point of grindy-ness - there appears to be no grease in the bearings at all. A strip down to look at the cones and pack them with grease is obviously the next step. After that I'll be having my first attempt at wheel-building, so it could be a while before any further reports on the hubs...