In computer science, what does winning a Sloan research fellowship say about an advisor? Some background: I'll be starting my PhD in computer science this fall and just noticed that my prospective advisor won one of the 2015 Alfred P. Sloan Research Fellowships.

Obviously the standard caveats apply: a good researcher can be a terrible advisor, and my success in a PhD and beyond will depend mostly on me. 

But, even though it feels a bit petty: I know advisor reputation and network matters both during and after the PhD. Can I talk this as a positive sign for both, and how positive? More practically, how well might a Sloan fellowship track with making tenure? Having my primary advisor not make tenure would be dicey.

Thanks!
The Sloan research fellowships are distinguished awards for early career faculty.  This means that your prospective advisor is considered a very talented young researcher.  However, it also means that your prospective advisor is not very far along in their career.  There are some cons to working with a young assistant professor as an advisor, including the risk that your advisor might leave the institution or not get tenure (not terribly likely for someone talented enough to get a Sloan fellowship but more of a risk in the generic case of working with a new tenure track faculty member.)  I think that most people would recommend picking a more experienced and well known advisor.