Thanks for the info Seren. Yes, if the quality is not great then all is not lost. It just converts the design to a pdf file which I can take to a better quality printer here. I will check out Asuka but since I am in Singapore, it might be an expensive option.
Hopefully the update to Aperture will have a big effect on the quality of the books. Just ten more days to wait and see!
The update to aperture won't affect the books, because the quality problems are with the printers. They're similar to blurb in that respect. They're nice books (and I use them as very cheap options for my wedding albums) but they probably won't last being handled too much.
But to someone who doesn't know much about image quality (i.e. average Jimmy) then they probably wouldn't see what the fuss is about. Really depends who your client is and who you're showing them too.
Plus the aperture and iPhoto ones have the apple logo on them - which sucks. I don't want my clients to know what printer I use because then they'll ask whey I charged them X amount for the book when they could have got it for less.