I have a smattering of those and like them a lot, too. The Lee 255 is a great bullet, I crimp in the top lube groove. One thing I do to ALL of them right away is replace the trigger/cylinder bolt spring with a Wolf wire spring. This accomplishes two things: First it takes the harshness out of the cylinder bolt "snapping" against the cylinder and eliminates the peening of the top arch of the bolt and marring of the cylinder, and second it makes for a lighter, more linear trigger pull force. The flat springs load up badly at the end of their travel and are too light at the beginning.
Another mod is to replace the cylinder base pin cross bolt spring with a Wolf Extra Power spring, because the base pins on all of mine had a tendency to jump out after a few shots. Other than that, they've all been good to go after a teardown, cleaning of factory gunk from the innards, and a light lubing.