Through the magic of Facebook I was able to ask 2 people whose 1911 knowledge I value (Hilton Yam and Larry Vickers) about using buffs in 1911s and both said the same thing. It was along the lines of "In a recreational range gun, it's not a requirement and there isn't too much of a benefit unless you are talking high round count. However, using one doesn't hurt but just be aware you need to keep track because they can break apart and jam the gun up [which to them could be life or death]"
I personally do feel a difference when I use them so I tend to, though lately I haven't because after the last one broke apart, I haven't yet bothered getting some replacements.