Ask HN: Experiences with retargeting?

I strongly suggest that you locate a retargetting company that operates purely on a Cost Per Acquisiton (CPA) model. There are enough high quality firms out there that use this model that it makes no sense what so ever to pay a flat fee. However you must watch out for view through conversions. I recommend you hit this article:

http://www.adoperationsonline.com/2010/02/25/retargeting-exp...

Make the plunge. I recommend AdRoll (though it's my baby, so I must admit I'm biased). As for second opinion, a large number of YC companies also run retargeting through us.

We provide great ROI bang for buck and charge transparently on a CPM or CPC. You can setup a campaign in under 5 minutes.

While I don't know much about retargeting, I've met Arjun, the founder of Retargeter, and he's one hard working dude. Really believes in what he offers so I'd be comfortable recommending doing business with him.