I have the Lee 4 die sets for several pistol calibers. I have found the post sizing feature of the FCD to be useful to fix the occasional finished round with a slight case bulge. I have used the sets to load fmj (9mm, 45 auto), plated (380 auto) and swaged lead (38 SPL) and have liked having the 4th die to have the option of being able to crimp separately. Just my 2 cents.