I HUMBLY think that the speed pros are tough on equip for all the reasons that are popping up. You'll get an occasional screw loosening that will cause a vibration, etc. Personally, I think HCA tested them over and over for limb failure and had none. So they said what the heck and went with it......regardless of anything else.
BK2,
If you are new to bowhunting, do yourself a favor and get a bow with a higher letoff and a higher brace height. I shot that bow in its first generation and second generation and it is a mean bow that is very unforgiving. No disrespect, but that bow will never let you know how good you really are.