I find that its mostly seek noise that dramatically increases if you hard mount the drive to the case. Motors are virtually silent on cuda IV (sp) but this increased a little with rigid mounting. Different drives and different cases will of course give different results.
I'm not sure that the vibration issue is anything to be worried about, mine have been "non mounted" with bottom drive sitting on some open cell soft foam, motor side down block just sitting loose on top. The other drive flipped over with motor side upwards on top of the w/b. No case connection at all except for thin grounding wires, data and power... two years now no obvious issues, although one seems perhaps a little "nosier" in heavy seek..
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