Some Feedback:
I ended up sending 13 books to
http://bookscan.us/ a couple weeks ago. I sent them using USPS Media Mail. It cost $7.04 to ship and only $1 each to scan... so the total cost for 13 books was about $20.
Media Mail took a while to deliver, but once the books were received, the books were scanned and uploaded to a dropbox account very quickly.
The scans look fantastic. I was surprised that they even included not only book covers and backs, but also the entire book jacket when there was one.
I didn't get any additional upgrades. The 13 files are about 475 mb total. I will probably eventually OCR them, if I end up upgrading ABBY.
The service was wonderful. I looked over the scans and one PDF had one page with a corner turned over blocking some of the text. I emailed them, and they very quickly rescanned the page and uploaded the new PDF. Customer service was top-rate with very fast and thoughtful communication.
I highly recommend this service and will use them again in the future. It is so much faster and easier than scanning my own books, and a very good bargain.