Darton invented and developed the CPS (controlled power system). The CPS gives the bow straight and level nock travel at all draw lengths. Hoyt tried to use the CPS to design their Cam and a Half, but changed some of how it works, some might say to try to get around Darton's patents. The failed at that, and the CPS remains an easy system to tune and keep in tune. The Cam and a Half reportedly has minor nock travel issues near full draw, and tuning for that system can be more involved. Really though, either system will perform and tune pretty well, and remain in tune well with good quality string and cable systems. The newer Dartons are using their version of the Binary cam system. It is so new on Darton bows, there is really no telling what issues they may or may not have. I have had several Dartons, and CPS clone systems from Pearson and Champion. I think they give very easy broadhead tuning and excellent accuracy. I do think if you are looking at '07 bows, only the Marauder is still CPS, the others are Binary. Hoyt makes a great bow, and on average Hoyt bows have been somewhat quieter than similar Darton bows. That may be changing. Hoyt bows tend to retain more resale value, if that is a consideration.