I have the t-mobile version. There's about a 2-3 tenths of a second sound delay with bluetooth audio. I have confirmed this on both my BT headphones (Moto S11) and my new Kenwood car stereo. You can see it with video and watching someone speak. When I disconnect and play on the phone speaker, everything syncs back up immediately. Strangely though, I just tested my moto elite sliver headset and I'm NOT getting the lag on that, or at least, it's virtually undetectable. Really disappointed with this discovery. Hope there's a fix or will be soon.