Summary: The Bose SIE2i is clearly meant for someone who doesn't want to be torn away from their music, no matter if it is raining, or he/she is in the gym sweating it out on a treadmill. It has very good vocal clarity, but bass punch seems to be a little underwhelming. The comfort level varies for every individual, but this one does seem to be a little tougher than the ones following a more "walk down the middle path" route.
Pros: Very clear vocal reproduction, Good audio handling at high volumes, The 'i' versions get microphones for calling, In-line volume controls are helpful, Short cable setup for when using the armband, Well built, Surprisingly light in the ear
Cons: Too much ambient sound trickles in, Bass isn't very powerful, Eartips are unforgiving, if not using correct size