You can't beat their prices, but WOW do they struggle hitting my prescription. I ordered a pair at -4 right, -4.5 left. They sent me a pair that measured -3.25 right, -3.75 left! I could tell immediately because the new pair is weaker than my old pair and I wanted a slight uptick, and I took it to a local optician to test it on their machine. Confirmed. I have a photo of the printout.

When I complained, they sent me a replacement pair - which was just as weak as the first!

I contacted them again, and they were not very helpful. They did give me a 50% refund eventually. I am using the new pair as computer glasses for close work. Which is good. But it's not what I wanted.

Meanwhile my wife is happy with her pair. She has a stronger prescription so I'm guessing their low-quality equipment has less problems with hers.