My guess is that these grab-release cycles occur in all brakes, but due to arm lengths, pad composition and braking force fall usually out of the audible spectrum, either by having too high a pitch or the sound being so soft that it's not audible over environment noises unless you get really close. I think the movements of the calipers are well within the material tolerances and fatigue limit of the brakes, so no worries there. Also, the release cycles are a good thing - locking up your wheels all the time would be very dangerous. Plus, repeated cycles only increase friction and that's what you want, because braking in the end is the transformation of kinetic energy in heat, sound etc.

My verdict: not a bad thing. But an annoying thing.