Yes, those holes really do add that China-like trash to any cymbal. Actually, the cheap version of getting that sound is to find a broken cymbal; same banana.
However since you're into modding the cymbal itself, it's getting the same risks as the cymbal manufacturers themselves, as they also cut holes practically the same way. Just make sure you pick a modder with a good reputation so that your cymbal won't crack easily.
FWIW I haven't had any cymbal done yet, but really the risks only increase when you entrust your cymbal to shoddy workmanship.
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