So even though for me it was a one-shot deal, I had plenty of time (I was moving) and it made sense for me to get their 'Platinum Membership' which includes many of the extras -- for a few months - which covers 100 sets for free each month. Still it was definitely expensive - more than I'd like. The end result were high quality (but definitely large) pdfs. I could use their "fine tune" services to optimize for different platforms / compress, too, but for me that meant additional storage / time if I kept the originals, so I didn't use it much. In the end I spent a lot of money, but now have copies of my books -- which I didn't have to ship long-distance and which I don't have to physically store now. I'm more-or-less happy-ish.