No longer use either, nothing in auctions brings cap and i rely on the internet for guides as to selling prices in my local area, I found the book was massively off when it came to selling prices, a quick google gives me a far better price guide.
I think the only time it comes in handy is when your buying up in the value stuff and you have to price extras ect adjust for mileage, a 3k Clio is always going to be a 3K Clio.