I had a chance to muck around with this product while it was in private beta. Super clean and easy to use. And it's been a great way to make better use of the Lytics segments that their algorithms define for you (in addition to creating my own).
[Full disclosure: Lytics is a PIE alum. I'm the cofounder and general manager of PIE (@piepdx).]
I interviewed Jeff Hardison, VP at Lytics, about this new product. You can read all about it in my article over at VentureBeat (http://bit.ly/28NdYCD).