This is the second book cover Maxi-1989 has done for me, and it turned out very well. I had a focus group look at the five best designs in the contest, and they virtually all agreed on the winning design.
After the contest there were some changes needed to accommodate the print requirements of two different printers, and those changes were made rapidly and accurately. I can't imagine a more friction-free process.
If you're considering a book cover designer, Maxi-1989 should be on your short list.