I have just bought a second ShadowCat. I already own a 2010 version, with CAT 1.5 cams and Barnsdale limbs and now I have added (thanks to AT) a second 2011 model with Nitro2 cams and Barnsdale limbs.
What's the same: Weight, balance, general feel in the hand.
What feels different: The draw up of the cam, WOW! these Nitro2 cams are smooth.
There is a distinct bump in the road just before the valley of the CAT's, also, as you start to draw up, you can really feel that you are pulling against the bow. With the Nitro's they are really easy to draw up and the bump before the valley feels smaller, as it is a lot less steep.
I am shooting fingers, with a DL of 30.5", shooting 340 spine 30" arrows weighing around 360 grains. I have both bows turned back around 2 turns from max in order to get just under 300 fps (max velocity allowed in the assoc I shoot within). With the let off set around 60%, I am getting a really clean release from both bows and they are both spot on accurate, but the 2011 is a lot less effort to use, simply because of the feel of the cams.
I would say the ShadowCat with Nitro cams has got to be one of the best bows currently available for finger shooters, especially 3D and field shooters like me.