Very well written !!

I love this little swiss army knife. My favorite thing about it is that it does not use your phone/tablet battery if the M4 is plugged in. Also, being able to charge and use the device concurrently is great. The fact that it automatically turns on the dongle mode when it is attached to a device - while the M4 is off - is brilliant. Lots of next level tech here. In dongle mode it sounds absolutely fantastic. Bluetooth mode is about as good as it gets but a good ear may detect that Bluetooth muted sound.
Great review!