Grabbed these from the post office today, and I have to say I'm pretty impressed with the quality. Took 20 days to arrive, weigh in at 360 grams or 400 with the included pouch.
I was lucky enough to look at some well used kathoola brand spikes on the weekend, so I can't compare side by side but I think these appear to be very similar in every way, maybe a touch smaller. Like others have mentioned I have doubts about the quality of the steel and rubber, but considering these are only 20-25% the price, I think they're a good buy for casual use.
I will say they fit quite tightly on my boots, 10.5 UK Salomon Quest 4D.
Time will tell though, and I guess this winter I'll find out. I'm pretty confident they're field repairable with some para cord that will keep them going for as long as need be.