I just had an unprofessional and unpleasant experience with Book Builders (they don't have a URL but are members of the American Book Producers Association). I recast a book for them and now that my payment is due, they are pulling a few more tricks in addition to the ones they pulled while I was writing for them (not sending the contract but repeatedly claiming they did over a seven-week period, trying to get more out of me than what was justified and contracted, etc.).
I have notified several professional organizations (including SCBWI) about their abuse of contract, good faith, and, in my opinion, morality. I would like to hear from anyone who also has grievances against them. If there are enough of us, as it seems like there are based on postings I've read elsewhere, we can help each other and future writers by speaking with one voice to these organizations, or at least comparing notes.
I'm taking immediate action but of course will not use anyone's name(s) without their permission. If you've dealt with Book Builders, please e-mail me at firstname.lastname@example.org