I just took my Boards in August and have to agree with the rumor that Boards are easier than the in-service exam. I think the scariest thing about the test is the possibility of having to pay that $1000 again if you fail. Otherwise, it's the quickest test you've taken since before the MCAT.
I used MKSAP + First Aid for the Boards ($80) and was very happy w/ my score. The only subspecialty book from MKSAP that I read was cards...for everything else I read the blurb in First Aid and did the MKSAP questions. Takes about a day or 2 to do all the questions for each subspecialty (depends on if you're working full time when you take it and whether or not you have the stamina that you used too in med school). I started studying in July and took it in August and felt well-prepared. My advice, save your money and go with MKSAP and First Aid. Good luck.