I have terrible problems with earplugs that fall out, the only good thing about these headphones is that they in fact don't fall out. The clip design works for my troublesome ears. However you should not buy these as the sound quality is terrible!
I have professional audio equipment (roland v-drums, xfi elite pro, marantz amp) and have tried them with other portable devices (creative zen, 3 mobile phones) and the sound volume is VERY low, they're extremely tinny unless you press and hold the earplugs right into your ear, but that's no good as i can't ride a bike or play drums while pressing headphones into my ears!
With all the portable devices I tried (mobile phone, music players, etc) I couldn't turn the device up enough to be able to hear the music while riding a tube or just walking down a quiet street!