And reliable? Consider that their first contact with me was made as a cold call to a number that is on the federal Do Not Call List. I think they got my phone number through the whois entry for the family publishing Website; it's the only place I can think of where they could have obtained it. This is a very aggressive tactic, and not indicative of a reputable company. It’s hard to believe that a marketing service that does not respect Do Not Call has a legal “opt-in” list of email addresses, though they claim to have just that.
Not that I can afford to pay for book marketing services, but if you hear from the folks at Book Whirls, I’d say “no, thank you.”
And then tell them not to call you back.