Watching the Tour Pros hit balls on the range

[noproblemos]

I watched a little bit of the late afternoon practice session on the range, at this week's Canadian Open. There was a total of only about 10-12 of these insanely gifted human beings on the range at the time.
Didn't get to see Elkington, Baddeley, Brian Gay (and J. Riegger's not here)

I noticed a couple of things:

on the range, the heaviest sounding compression came from none other than Pat Perez. His long irons sounded like fairway woods. But when I watched him make his practice swings, it looked like he had "throwaway" through impact. Any idea why he gets a louder "sizzling" sound than the rest of the guys?

Vijay was using the Swingrite training aid. I didn't know that anybody still used that!?! He was swinging that as hard as he could. I've never seen a Tour Pro put that much effort in trying to swing anything that hard. It looked very strange (the amount of effort).