Dillon make a very good press; however, I prefer the Hornady, especially when considered on a cost-effectiveness basis. The Hornady is, effectively, closer to the equivalent of a Dillon 650, rather than the 550B, as it is a true progressive, with the turntable advancing one station per pull of the handle, whereas the 550B is manually indexed (you have to operate the turntable by hand, it is not indexed by pulling the handle). Both are very well built, and both offer superior customer support and warranty. I have an old Hornady Pro-Jector, the forerunner to the L-n-L AP, and it just keeps soldiering on. I am considering buying a new L-n-L to augment it, partially for the ease in changing calibers on the L-n-L, and leaving the Pro-Jector dedicated to one caliber. I know Mike Dillon from the aviation community, and he builds a great press, but I consider the Hornady to be its equal and, in some details, better, especially regarding ease and expense of caliber changeover. When considered in light of the high quality of both, the cost difference definitely tilts the decision to Hornady. You would be well served by either, though. Have fun, and enjoy your new press!