I have a tendency to agree I have never been sold on the purple plus platform I believe the original Mopar purples camshafts to be superior and believe the added exhaust duration is not really beneficial in most applications. But by no means a bad cam.
This is an area of some contention. The benifical area the single pattern has is in the lower RPM band. The added exhaust is a top end plus. A lot of this has to do with the intake track, intake and heads as well as the exhaust.