Well, i'm just about over my excitement for adcenter. I have campaigns that are product relevence targeted and pushing a specific deal. For example keyword "widget brand model" "buy now at #*$!x"
I've received over 200 clicks and not a single conversion on adcenter.
Yahoo its a 2.2% conversion rate - break even.
Adsense is 3.9% conversion rate - break even. (higher cost)
Adcenter is a 0.0% conversion rate.
Adcenter = darn near 100% bounce rate and less than 30 second visitor rate
Yahoo and Adsense both had very LOW bounce rates and often more navigation pages - view TOS/Warranty/Refund policies and such.
Yahoo had a 100% first day purchase (thus far)
Google had a 60% first day purchase, 10% second day purchase and 30% > 3 day from first visit purchase.
So with that said, yahoo seems more spontaneous, google users like to shop around and dig around the site more and adcenter doesn't appear to be human visitors for my targeted electronics/technology/home audio/video/gaming/entertainment spectrum :)
adcenter did work "ok" before - it was a low enough cost but i'm wondering if that was just random traffic from a now defunct traffic partner or incentive adcenter may have had.
mind you, i don't mind the "branding" but i'm leary if these are real people even considering the brand.