Main reason I haven't tried them is that it appears they will not clear the string and cables or the riser. I would hate to hit the string and cable at "mach 1" with the hard fins. I would think they would be pretty hard on a string if they impacted it. I shoot a Q2.
You wont have a problem with the t4's , check them out . Im not pumping Nicks probuct , but seriously I dont know how pepole can put down a product they haven't tryed themselves . Reminds me of the Wisker Bisquet rest , pepole hammered it allso without even trying it , and the thing works great .