In fairness, we've been offering this since 2012 via our Segmenting API. Anything that can fire a JS event can be used to trigger retargeting. It's awesome and is in production all over the place: http://support.perfectaudience.com/knowledgebase/articles/21...
Clicks, form submits, time on site, number of sessions, last seen aren't available in AdRoll. We hope that by making those readily available, we'll be one step closer to make retargeting ads feel more like conversations, and less like...ads!
Also, we let you target the same people on Facebook too, and Google Remarketing doesn't let you do that, so there's that too!
The main issue are our servers being on AWS Europe, will move some closer to the US soon :)
Other than that, the offering looks great.
Edit: If I google your company, it's currently incorparated in Paris, France.
I'm a fairly senior digital media guy and am fascinated by ad tech (and almost ended up platform-side when I last switched jobs).
As I teach myself programming, I've been dying for great resources on the underlying guts of how DSPs work, API samples, algorithms, etc. but it seems like most of this is all highly proprietary stuff you only learn from actually working on an existing platform and seeing their codebase (which I'll almost certainly never have a chance to do).
Can you recommend any good resources for an inquisitive soul like myself who just wants to get a better technical view of the systems I've spent so many dollars through?