i have the GameMaster and find it to be very acceptable even with the factory limbs. (as i recall, the GameMaster II has upgraded limbs as the primary difference)
as Jacko said...there are 'tricks' to aid in quieting the bow; you just have to find the right combination for your needs.
IMO, probably the one most important factor in having a quiet GameMaster is shooting the CORRECT arrow for you and it. i, personally, shoot 3555 gold tips from it as it's a 40#'er and it's difficult to get much range using a 500 grain+ arrow
i even replaced the factory limb pins to aid in secure limb to handle connection to in vibration/noise reduction.
even with bow quiver in place with five broadhead tipped arrows in place and stabilizer, it's still lighter than most of my all wood recurves...