I have a 550B w/o casefeeder, and a 650 w/casefeeder. I love the casefeeder on the 650, makes reloading my 9mm and 40 a breeze. I am not going to buy a casefeeder for the 550 as it is my "quick change" press. I load 45/38 spcl/223/308 on the 550 and want to easily be able to change calibers on that one. My 650 is for doing multi-thousand batches of 9mm or 40 at one time, then I switch over from one to the other.
Tim.