I had a $100 gift-card to blow at Best Buy this past Christmas so I bought the BOSE in-ear headphones. They're totally awesome, not noise canceling, but definitely a great sound, far superior to any buds I've worn before.
Big problem though: The silicone tips fall off way way way too easily and get lost.
Solution: BOSE will replace lost tips as often as needed, for no charge.
So if anyone is like me and has been stewing because they have two sized buds in their ears (one of them way too small), fret no more. Just call BOSE customer service.
