This can be tricky if you're selling something on consignment...you may think your item is good to go but they'll often suggest having certain repairs done before offering the item, or selling it "As Is".
They definitely know their stuff however and the descriptions are accurate and prices inline with the market. I'd absolutely recommend them.
Better yet, if you can go there in person it's a really fun place!
: Are they a trustworthy outfit for buying a used guitar?