We were thinking about going with them but decided with SEOClarity. The guys at Brightedge were just creepy fucks.
BrightEdge looked like they had a better interface for drilling down to see specific keyword level data and better WMT/GA integration, but they were like 3x more expensive. The guy I spoke with was kind of odd, but that doesn't matter if the software is useful.
Google Webmaster Tools, Google Keyword Planner combined with Google Analytics conversion data, using Vlookups to sync data, then calculate MSV * AOV * CVR to determine the value of each keyword. The thing is, even if we just get 5% of keyword data from Google, with a large enough set of data, that is enough data to draw at least somewhat meaningful conclusions from.