I have just ordered the ultratec in spiral cam 1/2, I spent lots of time shooting several bows Hoyt, and Mathews. The cam and 1/2 is smoother than the spiral cam, but I went for more speed for the 3D's. I will say that at full draw the spiral cam is ready to go but just in a few shots you can get use to it. You have to go and shoot one that cam is not for everyone.