I had a lot of hiccups ordering from Warby Parker for the first time: USPS said they were delivered to my apartment when they had not been (which made me think they were stolen from my door), my return shipping of the trial pairs was never received (again, not the most secure apartment complex), and when I did finally receive my glasses, the prescription was wrong (by fault of my doctor, not WP).
Despite each of these problems, WP customer service was extremely understanding and accommodating every time. They extended the exchange period so that I had enough time to see my doctor again for a new prescription. They waived the fees ($$$) that I would have been charged if my trials had not been returned. Each rep I talked to was really nice and helpful.
And of course, the quality of the glasses is great. The selection is so good that I had trouble deciding, which was the best part of the trial option. I'll definitely order from WP again, and I'd recommend them to all friends & family.