The second I heard about the Dillon 1500 I bought one. Back then it only came with .the .223 and .308 dies. Major PITA to set up properly, it did work as advertised. BUT chips were a problem. Sharp edges were a problem. CORRECT brass was a problem. It seems Dillon designed the dies with specific brass in mind. If your brass was thick it sized then too much with the resultant stress cracks on loaded ammunition in almost no time at all. Luckily for me, I worked in a machine shop and got both dies honed by .003". No more problems with that. It didn't take too long to realize that for bottleneck cases you needed to do all your major cartridge prep work prior to loading on the 550. That is, sizing, crimp removal and deburring then to the tumbler to both remove any traces of lube AND to remove any burr left by deburring the outside of the neck.
Were I a serious one or two rifle cartridge shooter, I'd still go with the 1500 and the 550. And if you shot a lot of handgun rounds, the 550 is hard to beat.
When in shape, I could reload 600 rounds of 9MM per hour.