Not as flippy as one would think. The Stalker holds up on a turnover drive as well as holds a long straight flight. The mold is a Cyclone top and the new Stalker bottom mold piece. With those two things in place the disc is a longer flying Buzzz. My recommendation is to buy one. If you don't like it I guarantee you will be able to trade it.
I only know one other pro that was sweet on the Stalker....esp flavor. Not sure if he's still digging it. I watched it fly and threw it myself a couple of times. It was like a longer faster Buzzz maybe kinda sorta like a TL in the sense that it's a long mid or fairway driver. The Tl is a great disc, one I'm very in tune with so I saw no need for a stalker in my daylight bag. I do have a couple of new Glo Stalkers for the Night Flight Bag. Those puppies are both very stable, bordering on over. Even at 9 grams apart they are both as stable as the other. I plan on working one of those dogs heavily this up coming Glow Season.
I gave this disc a try when it came out but it never stayed in my bad. Too much of a tweener disc for the other things I was throwing and am throwing now. It is a great longer mid/fairway driver though...easy to control.