Anyone try these? Etymotic Research | Music•PRO Electronic Earplugs They seem like a more reasonably priced (with less features of course) version of this: 3D AARO | Sensaphonics I am finding that my current ER-20s make it too hard to hear the band leader call out the next song. I am also considering getting custom earplugs with swappable filters. These Music Pro models look interesting and the reviews have been just ok. So, anyone using them?