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I can't provide a first hand comparison because I've not owed a Dillon RL550. Keep in mind, though that the LNL-AP is more comparable to the Dillon 650 (five stations, automatic indexing). Everyone that I know who has a Dillon is well satisfied with it.
My Hornady has been very reliable. I've probably loaded about 5000 rounds so far, mostly .38 with a fair number of .45 ACP and a handful of other pistol rounds.
The priming mechanism on mine was fairly sensitive to fouling from spilled powder and other gunk. I polished the primer shuttle and got into the habit of cleaning it out periodically. As other have said it is easy to keep clean. Once the press broke it a little it seems less less sensitive. Primer seating is very good now especially with small size primers which represents most of my loading.
I am pretty well satisfied with mine.
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