Recently first page results for their keywords average:
Adwords: two duplicates, two PPC affiliates and two/three spam.
SERPS: 1 or 2 PPC affiliates
The conclusion? Serps look a lot cleaner and more relevant.
I would only wish Google/OV/ES etc would deal with these PPC Search Engine affiliates. They send users round and round in circles between the PPC engines, offer users no content and yet rack up cost for the advertisers.