Impact Radius, Anyone got Pros and Cons?

Hi all, I've been looking into Impact Radius as a network to use, but there's a dearth of info online about them, which is very odd as they've been operational since 2010 as far as I can tell...

Anyone have any opinions, please? Your words would be mightily appreciated.
 


I work with them for one program, so far so good. Tracking seems to be reliable, no problem with payments. I'm not a fan of their interface though.