I have only purchased clothes from thredup, and I've had a great experience in doing so. I started off just shopping for some clothes for my preschooler, but started finding steals for myself as well. Their referral program is also pretty good. As far as customer service, once I bought a pair of leggings for my daughter, and they ripped after one time use. I gave some feedback to CS and they promptly credited my account, which I was not expecting. Unless you were planning to simply donate clothes to goodwill/salvation army anyway, I wouldn't send my clothing for sale, as the payout seems to be very little.