You may want to check that the publisher is not on Beall's List of Predatory, Open-Access Publishers.
Surprisingly, the publisher in question is not. I've found Beall's list to be fairly comprehensive, but the vanity press industry seems to be booming.
Caveat: that list is just one guy's opinion. But it resonates with my own experience.
Update: As of late January 2017, Beall's list has been taken down.