Someone once said that about LZ iem's and look at the A4! IMO KZ will have enough QA for an expected $90 Hybrid that QC will not be an issue. I personally am hoping they hit it out of the park whenever it releases the ZSR
This.
KZ is stepping up their game and there's no reason for them to fail at it. They've more than proven themselves on the ultra-budget tier, so why not trust them when they're stepping up, too?
I've had 4 KZ IEMs so far and none had any QA problems whatsoever, and as Podster said it, they're sure to tighten up the QA process for their shiny new flagship model. And if they indeed deliver on the sound quality (which I truly hope they will), why not give them the $90?