I've got a 6" Stealth on my Marquis; I've been hunting with this combination for over a couple months now.
It seems to balance perfectly with it, and I'll probably use this rig at least once in one of the upcoming 3d shoots in the local area...
In addition to the incredible vibration-dampening capabilities this stab offers, they're also dipped at the same place all the Bowtech/Diamond bows are dipped at -- offering an absolutely perfect color match.