That's really interesting. I use aftermarket foam on my XM3, they fit solid and I could exercise with them in and not have them fall out (I don't use them for e

That's really interesting. I use aftermarket foam on my XM3, they fit solid and I could exercise with them in and not have them fall out (I don't use them for exercise however). The ANC is the really interesting part, it's practically flawless in the XM3 I've never heard any of the issues you describe; which worries me that the XM4 has an issue or two, hopefully software ones that can he remedied but it doesn't sound good. The XM3 doesn't support any sort of ear tuning, the feature in the app only applies to specific audio sources, none of which I have access to, so I can't comment on that part. I've heard good things about the little rubber wedge in the Bose, I'd like that feature, but honestly I don't have fit issues with mine so it's not a deal breaker.