God my M3 is still working I DONT NEED THIS !! !!
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Yes you do! 
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I’ve been using my M4 since about a month after they came out, and mostly enjoy them. A few things I don’t enjoy:
Random static sounds
Bluetooth connectivity issues
The cloth on the headband starts peeling off within a year. I had my first pair replaced because of this, but the replacement started it as well.
I’m kinda considering getting these because I do really like the M4 I have and it’s a great price. However, the issues really have me wanting to wait to see if something better might come around soon.