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If there is oscillation caused by the gaps in the circumference of the disc then two bad things are happening at the piston within the caliper bore
1. the piston is rocking within the bore
2. the seals are suffering a rapid forward and backward motion on the side where the piston has the most rocking movement i.e. the circumference of the disc (admittedly not of any great distance) but it cannot be doing the lip of the seal any good.
The only real benefits of a wavy disc is reduced rotating mass and un-sprung mass and a possible cooling benefit because of the increased surface area at the circumference.
Mine were purchased because they were cheap (Demon Tweeks) compared to OE or respected branded alternatives.
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