Once upon a time, in a land far far away, I dealt with competitive benchmarks at Microsoft for online measurement. I dealt a lot with Nielsen, comScore, HitWise and sat on a lot of conference calls drilling them on methodology of panel recruitment/measurement/etc.
In the last few months they’ve really jumped to the next level:

A former colleague sent met this comparison:

I’m still trying to get details on how their panel is setup - but it looks like hot shit. Does anyone have more information? I’ll post a followup as I get more info.