So I am getting actually 2 new pairs of the Brainwavz Beta in the mail sometime soon hopefully. I haven't heard them yet, but from what I've read they are excellent balanced IEMs for a great price. I just saw that Brainwavz is releasing the new M4. I had the M2 before, and I really enjoyed it. It had nice mids and pretty nice detailed bass. I expect the Beta to be similar to the M2 from what I've read about them. How does the M4 compare to all of this? If anyone is getting the M4, I might consider a trade for a new pair of my Beta's plus like 15.00 dollars. Thank you!