I was fortunate to acquire a pair of Falcons a few days ago and have been using them non stop ever since. I'm not going to get into sound opinions other than I've been using foam tips for years on the original K10s and going to silicon tips makes the Falcons sound a bit bright at times. Given the way the included tips are held on, will foam tips be possible? I will say the Falcons are by far the most comfortable universal IEM I've ever tried. They are so light, and just sit in place....my right ear always seems to have fit problems with UIEMs, especially with silicone tips. This design is very different then the typical ear-plug fit, the way the Falcons angle into your ear canal and rest in your ear creates a nice seal that comfotably stays in place.