As both a buyer and seller like anything else there are pros and cons today I will speak as a seller. (Also I probably would have given three and a half stars I didn't want to go as low as three and I didn't really want to go as high as four.)
Often times I will get emails saying "there's a new highest bid" on a particular shoe I have listed for sale. So then I go to accept and sell it and then that price disappears and drops dramatically. It's almost like a bait and switch.
As a buyer the turnaround time is very long and I feel this pressure as a seller to get my products out very quickly because they keep reminding you but I know for a fact I have waited longer than two or three days before a seller shipped something I bought so how are they getting away with that?
Also the fact that there is no 800 number which is probably everybody's biggest complaint.
Remarkably I had a pair of shoes that were damaged during shipping and I sent them back and I was refunded immediately I thought for sure I would have to wait or jump through a bunch of hoops.