Size; Memory stick expandability; Ease of use; sound quality; rechargeable battery; etc.

Price of player and memory sticks; also small screen does not display as much info at once as I would like, but not a big deal.

This player is awesome. Great sound quality, easy to use software, about the size of a cigarette lighter. The 128 mg memory stick can provide up to 4 hours of music. Also, you can buy more sticks. This is the perfect player for a frequent flyer.

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