That is so funny, I
just got these books this weekend for a present! I was grateful, but somewhat unsure of them, since it's information I can get for free - and more updated - online. But I actually like them! They'll make nice coffee table books for someday when I own my own coffee table.
The pictures are very nice, but the books are pretty much price guides, and that's it. I was hoping they'd have more history, or some of the interesting tidbits about the history of My Little Pony. I guess what I'm saying is they're great to look at, but I don't think they're especially useful as price guides any more.
They're also good for if you have non-pony friends or family coming to visit who are curious (or just want to pretend they are!) and want to look at pictures, but don't need entire lessons on MLP. I've caught my Mom reading these already!