Ugh, I have the xm4 and they are a great example of too many features. They sound great! However... I often use them while biking, and any kind of noise control is completely useless. Letting in sound would be great, but the wind noise is deafening. Which means that I cannot use the noise controls anywhere. If I'm on a call it automatically let's in sound, which cannot be turned off.

Not to mention that they must have been designed specifically to be impossible to hold without dropping them.

And regularly the left one reboots...