My first press was a Dillon 550 and I used it to load everything.  A Lee priming tool (not the Auto Prime) was given to me and I eventually tried it.  True, you do get a better feel for seating the primers than the Dillon, but I don't think the Dillon is that far off.  I have also used the RCBS tool once and was not overly impressed.
I mostly use the Dillon for priming.  Whole lot easier on the thumb, too.  <wink, wink>