I use bushings pretty regularly, ever since I had one project severely damaged when using a top guided pattern bit. The lock collar on the bearing came loose, and the bearing worked its way up the shank and above the template. Guides just seem a little more "foolproof."
They also remove any excuses for taking too big of cuts. Just chuck up a larger OD guide, and you can use the same template, but nibble off the waste.
I do have a favorite 1/2 in flush trim bit that I use a lot as well, just because it cuts so well.
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Doug
1 John 1:9
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