They are an excellent company to work with. We used them for a great number of titles that were duplicates and not transferred to the main University Library when the Kresge Business Administration lost our space for the print collection last year.
The real issue with books - and finding a good home for a disbanded collection - is the cost associated with shipping the material. While we would love to be able to send these to libraries that are in desperate need for books (especially overseas), the cost is huge to ship books - making the donation difficult to carry out.
Hope this helps. Feel free to write me directly if you have any questions.