The book is excellent, imo. That thread cited is a little misleading, because the Step 2 version of MTBs just came out, and before that people swore by the Step 3 MTBs book.
The Step 2 version places much more emphasis on "what's the most likely diagnosis?" - and is much better for the CK than the Step 3 book.
I've looked at the other books in the thread mentioned, and honestly nothing compares to MTBs. MTBs is basically 70-80% of what is covered in the videos/live lectures but in written form. It's not always explained in detail (if you want that, the red books do the job - but are MUCH longer of course). It's very high yield - I read the OB section the night before my exam, and it helped on nearly every question.
VERY good book. Must have.