One thing I've found about ivory ferrules is they seem to stay better looking longer than some other kinds of ferrules. I've been shooting with my current playing cue for about a month and its LBM ferrule has some scratches and chalk on it. My previous player had ivory ferrules and I played with it three times as long and they still looked brand new.
There was a brief adjustment period getting used to the ivory ferrules, as they hit harder than many other materials, but once I did adjust I loved them and, having gone back to LBM, in the future will only shoot with ivory ferrules.