I have been using a Creative Zen Micro 5 gig model. I really like that the batteries can be changed just like a cell phone battery and they are very small. Each one lasts 10 to 12 hours on a charge. I carry 2 extra batteries (total of 3) for long flights. Pretty happy with the device, except the unit's headphone connector doesn't seem to like my Shure E3c's but works perfectly with the OEM headphones it came with. Don't know if this is still a problem on more recent versions. Thinking of trying a splitter to see if that would eliminate the connector issue.