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Actually turns out I have the clip+ non-sport version (I hate name stacking when they add models). Capacity is capacity - 16gb gets you a ton of mp3 files at 320kbps, not so many at full cd quality...
Ease of use? No problem, everything is tactile, so not so necessary to be looking at it to make changes once you're familiar with the controls.
Since it's not exactly the same model I can't really comment on run time, though mine can go all day (rated 15 hours).
I'm less worried about sound quality (use while riding) than I am about capacity, ease of use and battery life. Any comment on those?