It is for me. But I use mine differently than most others do. I use my Lee CFCD to full length size my revolver brass prior to loading. This gives me a smoother exterior case wall without overworking the brass like my normal carbide sizing die does.
I still use the normal carbide sizing die to size the upper part of the case that bullet seats into.
I haven't found the need to use the Lee CFCD after seating the bullet. Everything chambers and functions just fine with 100% reliability.