I consider the need to have a hype, show and attention for signing day to be a character flaw... I would be interested in the track record of signing day announcers and switchers. Of course, one has to realize you have to be a very special talent to have two or more top coaches holding a scholarship until (or after) signing day.
And since Prima Donna means first lady... how many turned out to be the real deal and how many turned out to be... don't want to get the feminists riled up, you get the picture...
My guess is more fail or become problems to their school than similarly rated (5*) players who do not engage in the hype machine.
Please add to the list:
Terrell Pryor - developed into a streaky but occasionally great player... got bounced for selling memorabilia in tattoo gate...
Proved the Hype
Emmitt Smith - Left DONU at the alter for home state Florida. All American, All-Pro, NFL Hall of Fame