I was super super nervous about purchasing glasses online because anything could wrong so easily. I spent 2 weeks deciding if I should order from Warby Parker and I'm glad I made the decision. I got polycarbonate glasses with the 1.67 high index (since my eyesight sucks). I followed the instructions carefully like they legit said to do lol, and they also suggest talking to your optometrist too, but I know I didn't have a reason to. Anyways, the glasses shipped in 11 days, which is right in between the time they said they would come or somewhere around that. They came in a very protective style along with a case and cleaners, so the usual. My glasses are cute and the prescription was accurate! Love them so far. The people on the help chat were also super nice and helpful.
*Note: most people who did not like WP probably did not look in detail with the instructions or talk to their eye doctor for more information like the site said one should. Or someone who has such privileged expectations that nothing next to perfect is "horrible" so yeah WP is great! Esp. For young people like me who actually like nerdy glasses :)) ))