I've had quite a bit of gear of this chap (Andres), and have nothing but praise for both the service and quality of the gear.
First (3/4 leggings) order didn't fit, but were swapped over quickly and without any quibbles. Replacement pair were perfect fit
2nd order - tights as in the OP's photo - perfect service and fit.
3rd order winter windproof membrane bib tights - perfect service and fit, and got a free gift as a 'thank you' for my previous orders
4th order grey/back 3/4 leggings were a strange fit (baggy round the back of the knees). These were sent back and Andres checked them against others in stock of that size/other colours. He couldn't see where the problem was but refunded me without quibble.
5th order - black 3/4 leggings (as per 1st order). These arrived promptly, as per usual, and he'd kindly included an extra pair of black/red ones with my order for me to try for size, with the request that I send one of the pairs back after trying them. I've kept both and paid him for the extra pair... again he sent a gift as thanks.
Throughout, the quality is the gear is all very high for the cost and I would put it slightly above that of Endura. The sizing is a bit larger than you'd expect, so where I take a med in Endura, I take a small in Stantex.
Can't think of much else to say, except that I an not involved with the company in any shape or form, apart from being one very satisfied customer