All MacBook Pros that I've seen (I have 2, employees have them, many friends, colleagues, and clients have them) have 3 prong connectors. Never once had a buzz from any of them.
I think it's more to do with the specific power supply or laptop and not just the 'presence of a 3-prong adapter'.
Question though, I've seen many PC's without a ground prong on their adapter. Are these inherently unsafe, or is there something different about those power supplies? In other words, why is it unsafe to remove the ground prong from a 3-prong supply when some PC's only come with a 2-prong supply in the first place?
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