Sony has its share of admirers as well. The D series attracts kudos for performance and features from professional reviewers like CNet and Etown, and consumers at Epinions and Amazon. This hybrid unit, which plays both audio CDs and MP3 digital music files, has excellent skip protection, these reviewers say. Look for a minimum memory buffer of 40 seconds . Cheaper models have smaller buffers, so they aren't good for driving, jogging or even walking, unless you don't mind losing a few seconds of your favorite songs.
Buffers also help units play dirty, scratched or otherwise damaged discs.
Anti-shock technology keeps CDs spinning smoothly during constant motion . Because portable machines tend to get knocked around, they should be ruggedly constructed . Metal or heavy-plastic components are preferable to lightweight plastic covers that crack if tapped the wrong way. Gadget freaks know that the best portables are thin and tough. The newest portable CD players boast battery lengths of 40 hours and up .