I was wondering about this one, as well. I've looked at it a couple different times. I work for a family office doing tax and various advisory services so I thought this might be helpful in my current position.
I am planning on getting the PFS. I work for a family office on the investment side, but I see the PFS as a benefit to expanding my current position at the firm. My husband is a CFP and says I should definitely take the exam to get the PFS. Just a few more courses and an exam that pales to the CPA. Might as well.