I was wondering if there are any flanges out there that fit the M6 but have a better seal than the stock tips. I find it very hard to get a good fit with the ones that came with it. Foam tips would be OK but they have to be replaced semi-frequently which would probably never happen. I imagine it would also get rather gross for someone else listening to music through them. Like most others, I currently get the 'best' fit with the bi- and large tri-flange tips, although it takes quite some time and adjustment to achieve.