I don't know if this qualifies, but it's definitely not done by Google: http://dev.opera.com/articles/view/opera-spdy-build/ http://dev.opera.com/articles/view

I don't know if this qualifies, but it's definitely not done by Google: http://dev.opera.com/articles/view/opera-spdy-build/ http://dev.opera.com/articles/view/opera-spdy-build/ It's not a "study", per se, but it does corroborate Google's claims.