As someone pointed out earlier, the complaints about the M2 Wireless on this thread make it seem very "doom & gloom" and suggests to the casual reader that there may be some serious flaws with this model when the reality is that those who have posted are not necessarily representative of all M2 Wireless user experiences since there may be many who don't have issues at all and aren't posting because there isn't anything to go to a forum thread to complain about.
I am one of those without issues. I've had my M2 Wireless for almost 2 weeks now and could not be happier with it. Comfort due to the larger ear cup size is a remarkable improvement over my M1, and there are some sound improvements too, though subtle, that makes it less balanced sounding than the M1, but in a good way (more bass and improve treble, but not necessarily V-shaped). Best of all, I'm not having any of the bluetooth issues that a few are describing here. Sure I will get occasional drops and stutters, but it is very rare and only happens when I walk away from my source device too far or if there is lots of interference in the room I'm in. Interference is unavoidable people! This is not the fault of the headphone but something inherent in wireless technology. I have never owned a wireless consumer audio device that was perfectly immune to interference. Compared to many other bluetooth audio devices and headsets I've ever owned, the M2 Wireless is definitely better than average if not the best I've had in terms of being resistant to interference. I rarely have issues when walking around in public indoors our outdoors streaming audio from my iPhone in my pocket or my iPad in my shoulder bag. At home, it almost never happens, which was surprising to me because my home has serious wireless traffic which includes: multiple wifi networks, wireless media streaming from NAS, several desktops, tablets, and laptops, 3 wireless printers, wireless connections to receivers, TVs, 2 wireless baby monitors, wireless lighting control, wireless thermostat controls, wireless VOIP phones, wirelessly connected PS4 and Xboxes, RF remotes, and a multitude of USB 3.0 devices which are notorious for causing interference. My M2 Wireless works just fine in this environment. I love this thing. It is the ultimate in portable wireless cans in my book.