Now the cons?Unfortunately they change the sound signature of headphones very much and for me this is the biggest issue with them. The volume limiting appears to work quite well. Hangers are nice esthetically and sturdy. These did not disappoint. It did the opposite of what it was intended. It mixes a lot of linguistic concepts with common-sense. These greatly increase the comfort of these IEMs and give youa better seal which gives you a better sound. Por fin pude conseguir algo que se adaptara a mi espacio para organizar mis zapatos. I was used to using the first stage for comms, but I was able to adjust to the side button for teamspeak and SRS. I spent some time with co-workers comparing what I sound like using my Q20 versus my Q30, and they all told me I sound like Im "in a box" when using my Q30s.