Yes And No.
If you are an aspiring powerlifter then hell yeah, if you are a serious lifter always and are stalling or are finding out you need to tweak the template on 5/3/1 then yes. If your thinking this is the newest greatest thing since sliced bread then you would be disappointed if you already own 5/3/1.
I am starting to think of it as 5/3/1/part/2 The Next Step.
The book makes real good points and has a great philosphy behind it in regarding lifting and making continous gains in general.
Has good reads on training for the Raw and for the Geared lifter.