The 750 had already come off my bench with the anticipation of adding a FA X-10. As already mentioned the delay of the X-10 happened to coincide with the introduction of the Pro 6000. I thought it would be an entertaining distraction which turned out to have been an excellent choice. I don't feel I've missed much in not waiting for the X-10 (it's still going through growing pains) and the Pro 6000 offers much more than the 750 did.
I've recommended the Lee Pro 6000 to several folks over the Dillon 750 already and don't see any reason not to. At it's price point, it completely buries the Square Deal and does everything most folks would use a 750 for, for a much smaller investment