I'm pretty committed - - -
- -To Dillon dies, IF you're loading cast or swaged lead bullets. The design makes it super-easy to clean out the shaved lead and lube that accumulates in the innards.
Once the dies are adjusted and locked into place in the toolhead, you're really set. If you will send the few dollars to purchase a toolhead for each set of dies, there's no reason to ever need to adjust the dies again, other than the seating stem. All you have to do is to pull the wire clip and the insert of the die drops out for cleaning.
I use a lot of RCBS dies I owned when I got my 550B, and some others on which I've found good buys since.
Another reason to use Dillon dies, though, is that they are chamfered to allow for easy entry of the case into the mouth. I've ruined a LOT of .380 ACP brass on my RCBS dies in the Dillon toolhead.
Yes, the Dillon dies are a touch pricey, but for loading lead handgun bullets, I believe they're worth every penny.
Best,
Johnny