I know there are other print on demand publishers who have better quality, but Blurb's advantage is the bookstore where you can send people to buy the book. My idea is to see if I can do a book there, then publicize it, just to see how many I could sell. That would let me know what the risk (and feasibility) might be for me to, with the next book, to actually go to a high quality printer (not print on demand), and get a couple thousand printed.
(And btw, if anyone is thinking about doing a Blurb book, they are having a competition & the deadline is this month.)