Good question ^
To update my post from before, Carvana has now opened a massive, brand new processing center here. It dwarfs Drive time, Carmax, and all the auctions. They even have paint booths...yes booths with an s. No telling how many lifts and alignment racks. It is huge and every bit of it brand new from the ground up.
It's funny dealing with their parts people on the phone though, some seem to have no experience at all. I took a call from a lady there wanting an oil seal on a Kia...she had the VIN, someone at least taught her that much, but as soon as I asked which oil seal, she went "uhhhhh," and I described the different seals that hold oil. Still no go, so she set off on the phone to find the technician who she apparently had never met or seen before. She's asking people which way to go and what their names are, then finally finds the tech. He tells her he needs the oil pan gasket, which I tell them is sealant. I offer to look up the Kia/Threebond sealant, but they declined, apparently already having RTV. They have also asked for a turbo oil feed line on a car with no turbo. The stuff they do buy, they pay for and keep though. We go out there twice a day sometimes just for Kia parts and have had no issues aside from confusion over what they need.
I would consider a vehicle from them. Given that they are still snatching up every low mile 2010-11 2.3 Ranger available I'll probably have to if my 02 Ranger kicks the bucket anytime soon.