I like Sennheiser's stuff, but the MM 100 is a full ear headphone, not an earbud-type like I'm looking for casual use.

If I wanted the appearance & motion drawbacks of full ear, I'd probably just put the mike boom on my Koss 4AA's & go wired.

One of the drawbacks for me of the BH-905 is that I'm not a fan of the head clamp type for casual earphones. It's just a little "I wish I was on Star Trek" for me, but I'm weighting that less because the microphone performance of the BH-214 could be unsatisfactory.

The BH-214's small storage size is a plus for it also.