Sampras was a great player, but I never really liked his style of play. As a baseliner, I far preferred Courier and Agassi. As a serve and volley player, I far preferred Edberg and Rafter. Maybe it's unfair to compare him to the best of given styles since he was competent all around.
Agassi, though he's careful to give Sampras his due as an opponent, has some very interesting observations about him as a person in the book.
