I think it is about 1/3 of the traffic for a specific term if targeting search network and google. I do not see a drop off in quality on the few tests i have run. Anyone else agree with these statements? Or have an opinion?
I can't comment on google vs google + search, because I still haven't shut off search for anything. This generally leads to the conclusion it is good quality, because I certainly don't have a shortage of performing keywords.
If something hasn't performed I usually just dump it, I know I should probably try it on google only, I just haven't even though its the smart thing to do... instead i've spent my time looking for other opportunities/terms.
(Now content on the other hand, i've shut off on plenty campaigns)