Has anyone here used, bought from, or heard stories (good and bad) regarding Guitar Center's online section for used gear?

Today I took a look at the keyboards and was shocked to see a good selection of "oldie-but-goodie" boards on there for very reasonable prices.

I've got a few that I'm keeping an eye on, but have never purchased used gear from them. I would "assume" that considering it's a music retailer.., that the gear is properly checked for functionality prior to posting it for sale.