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Don't even think about taking AS off a good performing page to replace it with YPN.
The targeting of YPN is still absolutely horrible, but they're still in beta. I was hoping it would be better by now, but we're still waiting. As a result, the CTR is just distastrous.
As far as customer service, YPN gets high marks across the board.
I would definitely recommend them.
I'm finding what is said above about low EPC/CTR pages is true, but I'm also finding many very high EPC/CTR pages are doing VERY well when the targetting happens to work. When targetting is working I'm often getting 3 to 4 x better EPC with Y.