you'll probably get shit from them....when i took my 01 impreza there a while back, before it was modded, they said they'd give me 7 grand.....that's like almost 8 grand less than they go for everywhere else. but that's kinda a rare case with bb value and car rarity.
however they offered my friend 4 grand for his 99 v6 camaro that was almost absolutley flawless.
but since it's a free appraisal why not just go and see.