I HATE the iPhone headphones - they suck for working out - constantly falling out. I have an oppurtunity to get the Shure I2c-m (carried at the ATT stores) for only $50 (usually $100). I've read some reviews that say these are good, but not "all that great." However, those reviews may have been based on the $100 price tag.... Those of you that have had, or still use these, what do you think? Are they worth $50? Thanks!