Self massage?

Is it and can it be as/more? Effective than getting a massage from someone else? I try to get a full body deep tissue massage every couple of weeks, my main problem areas, or places that I really like a massage are around the head, ears, neck, shoulders and back. I can reach those places pretty easily myself and many a times I know exactly how much pressure, and exactly where I want attention.

So what is the benefit of getting a massuese in this scenario? Is it more a relaxation/treat thing? Or is a qualified massuese just so much better?