Vaccaro is a safe pick, but not a spectacular pick. He isn't elite in any area but he is solid all around. He will be a productive starter, but doubt he makes many if any pro bowls. I would rather go for a guy with home run ability to rush the passer.
I don't think he is safe at all really. He is a little stiff and has very little recent tape of him actually playing the back half like a true safety. Now, he is a very good athlete and has good size. He also does pretty well covering slot receivers (which is impressive). But, for me, there are a lot of question marks.
Even if Bill Belichick was getting an atomic wedgie, his face would look exactly the same.