I stumbled upon these, and knowing Audio Technica?s reputation as a brand, I decided to pick em up. Based on this and other reviews, I recommend sizing down closer to what the smallest size you can comfortably wear would typically be. Edit: I was able to fix my M-100?s by Unscrewing each ear piece out and jossling the wires around a bit. The G9700 also made the volume markings simpler. My daughter will be 2 next month and I purchased a 2t. I actually still use that mouse with my laptop since I cant stand trackpads, but this DeathAdder Chroma I now use with my desktop. Once taken out from the case they pair instantly without effort, each time every time. Its comfortable and not restricting like I cant breathe. As far as sound quality, I really like how they sound but my son who uses airpods think the ec90 sounds "terrible. Very soft yet well fitting support.