I have owned a 550 and now own a Hornady. Both are great presses. I liked my Dillon 550. It is a great press.
Do consider the Hornady press as it has 5 stations which sometimes is an advantage when using Lee crimp dies, I like Hornady's powder set up better, I found it easier to go between small and large primers easier and it auto indexes. To get 5 stations and self indexing, you have to go to a Dillon 650. It also easier to remove cases from Hornady's shell plate for inspection.
For me, Hornady has matched Dillon's no BS warranty if a part breaks. It just took a call to their customer service and I explained the part breakage was my fault. They shipped a replacement part ASAP at no charge.
