After recently doing mine (went from 13" bars to 16" bars) I'd say that for the time and money it's not a necessity unless you go taller than 14". I had the stock bushings with my 13" Road 6 Custom bars for a year and 1/2. Never had any problems, gripes or complaints. I am glad that I changed them out for my 16" bars though.
A word of advice, if you decide to swap them out have a buddy come over and help. Having an extra set of hands was a god send when I did mine.
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