I didn't believe it until I wore these glasses for the first time. For 72 USD, I managed to get the best glasses I ever had, where, for an equivalent quality, it would have cost me approximately 700 USD (10 times Tenda's price) if I had bought them from a French optician.
First, the frame in titanium is light, elegant and extremely robust. The glasses are thinner than my previous extra-thin glasses, seem unscratchable, have a level of transparency that makes things look clearer than ever, and the performance of the progressive lenses, which often is an issue, is impressive: Indeed, I used to remove my glasses to look at close items like most short-sighted people do, but amazingly, with these glasses, I don't feel the need for it any more !
I don't understand how and why people still buy glasses at French opticians, at a considerably higher price and a lesser quality !