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This might be a tad late but ATI now has an 8 rib pulley which takes care of the slipping issues. I konw this because my car has it. Just got the D1SC procharger. I like it better than the vortec setup. One plus is the charger works on its own oil system not the cars. TT is just a pain to setup I think. I enjoy my ATI but everyone has to make up there own opinion.
Not as late as me
It never really was the belt at fault even though only a 6 rib belt is ludicrous. It is the belt tensioner they use. They have made strides to better it for the mustang camp only, and have forgoten about the F bodies.
Hopefully they will get it together, but I dont really see them worrying about it, because they dont make alot of money off us. If you stay below 12psi I would bet you would never know the differance, but making above that will be the challenge.
The self contained Supercharger could be a personal bias but I like knowing when the car gets new royal purple, so does the blower. You dont have to tap the pan with the other way, but when you rebuild and put that fancy sheet metal pan on you can have a threaded hole put in

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You cant go wrong with either one bottom line. Two great systems designed for two differant missions. Procharger = daily driver/auto X, Vortech = 1/4.