i've had BEPO on my site for a few years. one thing i don't like about the set up is entering all the prices.... soooo annoying! there needs to be an option to just set the percentage you want the mark-up to be. for that reason alone, i don't like it, but also, clients i've directed to it, as a way to keep from paying me to do the layout... always come back and are willing to pay me to do it.
so, while i have BEPO, it's pretty much idle.
i should mention, i typically only handle printing for my own design clients. i don't offer printing to the general public as a rule.