Ok, so here is some info you need if you are considering print-on-demand publishing with any company that will get your books to a major distributer- major bookstores, like Barnes and Nobel, will not allow your customers to return it. For the life of me I can not figure out what the difference is, but I am sure it has something to do with archaic distribution methods that they are unwilling to change. So, if your customer receives a book that was defective, through no fault of their own, that person is screwed.
One more thing, print-on-demand books are not welcome in the stores. They will placate you and say that a committee will review it, but if you are not a friend or relative it ain't happening. I appreciate the honesty of the regional manger at Barnes and Nobel.
These issues will become more and prevalent as more of us choose to be environmentally responsible with our art. So, the moral of this story is that people need to buy electronic or go to a print-on-demand publisher like LuLu.com to purchase an actual book, they have most all of them now, if you want to be green.