These SCVCN photochromic glasses are simultaneously great and terrible.
I wore them a handful of times and they quickly became my favorite glasses, but they can't survive a 5 ish foot drop onto carpet.
Arm snapped right off.
Tbh considering I paid $2, I'll probably buy them again. 
Similarily, I like the POAT photochromic glasses (pretty sure it's a POC clone). The ones with the multicolour sides are built better than the solid colour sides (they use a different plastic for the solid black or white glasses arms and it feels much cheaper). One bad thing is the lens pop out once in a while, but you can just pop them back in no problem.
I have 4 pairs that I cycle throughout the year, and no issues with them. They've survived falling off my helmet quite a few times too, everytime the lens just pops out and once you pop it back in it is good ads new.
I've been meaning to try the SCVCN but I bought too many of the POAT ones...