RE: guardian or vectrix or vulcan??
The Guardian is the quietest bow I have ever shot. No recoil or hand shock either. You shoot it and you have to check if it really went off. I just got some new 3D arrows that are around5.5grains per pound and this bow is still really quiet. I thought it might get a pop shooting such light arrows, but hardly noticed an increase of noise from my FMJ's which are more like 7 grains per pound.
I had shot Mathews since 1996 and decided to make a change. The Guardian just was the best shooting bow out there for me.