I haven't. Not that I've paid that much attention over the last couple of years, but I had the feeling they had caught lightening in a bottle with that D and would backslide some going forward. Is what they have going sustainable?
MSU has won at least 10 games in 4 of the past 5 seasons, so they're already sustaining success fairly well.
A big key to that has been finding hidden gems. Leveon Bell and Darqueze Dennard were 2-star recruits, and Kirk Cousins was considered a MAC-level QB. And now with winning they're starting to attract more big recruits.
2013 will be hard to repeat but I think they're very capable of staying at the 9-10 win level as long as Dantonio is around. Two concerns would be that they've benefitted from Michigan self-destructing and that won't last forever, and I'm not sure how much longer they can hang on to Pat Narduzzi who is arguably the best defensive coordinator in the country.