When they first came out, my DDs loved them - and the CMs had great fun filling them out, including personal messages to the girls. Lately, it seems the KidCot stations have overun the Passport spots, making it difficult to even get the CMs to stamp the darn things, since the kids at the craft tables use the stamp on their little crafts. The "no, I'm using that" got to me after the third country...
If you have the time to wait patiently for the one CM to do all the crafts and signing and stamping, then go for it. It's a great souvenir, and my kids used to love doing it.