I've heard a lot of different things about it...It helps you play the run and get off the snap a tick or two earlier...I would say that 61 is more then enough IMO...Others might say triple cap....
It really depends on what you want your build to be(pass rusher or run stuffer) and what your build looks like now.
60 vision is fine, 90 speed is fine. But you can never have enough agility, well maybe 125 is enough but my guy isn't there yet. The proof is in the numbers, 121 sacks last 2 seasons, and maybe 50 were junk sacks against OTs that were out Lvled by more than 4.