I have been fairly happy with AdRoll. I have been telling everyone about it. It is a no brainer and so few people know about retargeting.
I know Google adwords has retargeting, but I can't figure it out. Even after watching tutorial videos. What a shame!
But one thing that is annoying with AdRoll is their $25 per month per campaign minimum. I wanted to have some specific sub-targetting ads (people visiting just certain parts of my website) and it would cost another $25/mo.
So I want to try Perfect Audience.
I will let you know how it goes. I have not been impressed so far. Several "good luck to you" F off type emails instead of what I consider good customer service of "so can you tell me what you are trying to do so we can help you." Maybe Brad Flora will get this and start to attempt to be helpful.
And then I can compare and hopefully be a new evangelist for PerfectAudience.com