Obviously you can not go wrong with either one. I have an older Rock Chucker and I still use it. RCBS warranty is top notch, but you will more than likely not need it. The biggest complaint I have about it is the way it handles spent primers. The tray they have lets the little buggers bounce all over. I "fixed" the problem by punching out the primers before hand on a cheap Lee press (I also use it to pull bullets) with a universal de-priming die. I am not sure if the newer Rock Chucker presses handle the spent primers better or not. I think the Boss drops them down a tube into a trash bucket or jar. This, in my mind is better, but it is all personal preference, isn't it?