I recently got the Custom-2s in place of the Ultimate Ears Metro.fi2s. I had some issues with those and opted for the Klipsch set. I was using the smallest silicon ear thingy on the UEs and have to use the largest ones on the Klipsch. This seems odd to me. Also, the bass on the UEs was more in-your-face than on the Klipschs, which also seems odd given that they are better and people are "wowwed" by them. Further, when I smile or breath heavily (I run a bit since I'm in the military), the seal seems to break. I can live with not getting the bass whbile running due to running, wind, etc. But if I'm just listening to music or watching a movie and have to laugh or smile, I dodn't want to have to reseat the entire thing by pulling on my ear and jamming them in. I have no doubt that these are good headphones, I'm just wondering if anyone can give me tips/advice on setting them up for use. Thanks.