Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
The first MP3 CD players were picky about what discs they would play and lacked any features beyond bare-bones playback. But these products have matured quickly, and after seeing Sonicblue's Rio Volt, we're ready to say that MP3 CD players have arrived. Aside from an awkward carrying case, we were hard-pressed to find anything wrong with this player.  Best of breed To put this device through its paces, we burned a number of test CDs, which included MP3s and WMA files with a wide range of bit rates. We used CD-Rs, CD-RWs, discs with everything in one root directory, discs with songs organized in folders, and a number of different burning preferences within the included Easy CD Creator Standard 4 (for PC) and SoundJam (for Macintosh) software packages. Much to our surprise, the Rio Volt handled every disc that we threw at it with aplomb. It's also only the second MP3 CD player we've seen that reads ID3 tags (the Pine Technology D'music SM-200C being the first). Without ID3 tags, you have to plod through 150 songs on each CD using only track numbers as a guide, so we consider them a necessity. It's also the only such player to play WMA files as well as MP3s and audio CDs.  But there were many other reasons to be impressed by this newcomer. The +10 button, which lets you jump ahead ten songs, makes navigating more than a hundred songs much easier. You can also group your songs in folders, since the Volt lets you navigate within directories, unlike the other players that we've seen. A Shuffle mode lets you skip around between all the songs on the CD-R, while the A-B mode is useful for looping any section of audio. We were as impressed by the player's form as we were by its function: The understated, rounded design is starkly modern compared to those of other portable MP3 CD players, which often look like prototypes.  Skip the skipping The Volt collects 120 seconds of audio from MP3/WMA discs and stores the sound for playback in a flash-memory buffer. When playing back standard audio CDs, you can choose between 10 and 40 seconds of antiskip protection (40 seconds consumes more power). While walking around with the device in a bag, we encountered an occasional delay when fast-forwarding between songs on an MP3/WMA CD. However, once the music started playing, skipping was not a problem.  If we can single out one problem with the Volt, it would have to be the carrying case, which must be threaded through your belt if you want to attach it to your hip. (The player itself doesn't have a belt clip.) While the player is in the case, you can't tell which song is playing or whether the player is on or off, since there's no display on the remote control. But at $..., the Rio Volt has to be one of the best portable audio values around. Unless you really need a very small, light MP3 player for exercise or travel, multiformat CD players such as this one are the way to go, since they're cheaper and hold many more songs on a single CD. Some other players cost a little less than the Rio, but its ability to play every type of MP3/WMA CD-R and CD-RW that we burned definitely makes it your best bet.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: B: positive