In my experience, it's made the ANC much worse for the APPP2. I had sent a feedback report to Apple to let them know, but have heard nothing. The original ANC was great, apart from lacking cancellation for the highest frequencies. I've had to wear ear defenders in the gym because of poor speakers playing a radio station at 60db. The ear defenders muffle the sound, and that's great, but it gets hot!. I think Apple should offer an ANC slider, a bit like a volume control, to decide on a personal amount.