I have three of these, two old, one over 30yrs that I have had since new, and one of more recent vintage. This means I have both old and new, and I can say that every one feels just as smooth as the others, and they have been smooth with no change of feel that I have ever been able to discern from day one. (in the case of the one I got new)
No offense to anyone, but I do not agree with any of the ideas of "broken in", or this ratchet design and durability having to take a back seat to any others. I have had this design of ratchet longer than any others I own decades later I would still rate them at the top of the heap. I often grab a Craftsman RHFT over my Snap-on, Proto, Armstrong, or Williams ratchets because they are just that bullet proof in reliability, feel, and design. In over thirty years of use I have never had a need to rebuild, relube, or exchange any one of my RHFT ratchets.
Simply use them, wipe the crud from them, and toss them back in the box, it is really just that easy! (Say no to breaking them in!)