This is my second MuVo. It is replacing a 256 MB MuVo TX FM that I have been using for the last 3 years.
http://www.epinions.com/content_240195178116 I have been very happy with that one, and simply wanted some more storage capacity.
I primarily use my player to listen to Podcasts in the car through an FM transmitter. I wanted to also keep some music available on it as well. I tried a Sandisk E140
http://www.epinions.com/SanDisk_Sansa_e140_1_GB_MP3_Player and although I thought it worked well for music, it did not suit my usage. (My daughter, however, is quite pleased with the Sansa) One of the big differences is that the MuVo, when turned on, will pick up exactly at the point in the track where you turned it off at, while the Sansa starts at the beginning of the previously selected track. This is important for me, as some of the podcasts I listen to are over an hour long. The Sansa organizes music according to the ID tag information in the files, where the MuVo does not.
The MuVo uses user created folders to organize the music and you use the "skip folder" function to navigate to what you want. The V100 has an element in that respect that is new compared to the TX it replaced: It has 3 default folders labeled "library A" "library B" and "Library C". I deleted these folder and created my own "Podcasts", "Music" and "Funny stuff". The Library folders were recreated by the device when I turned it on. The documentation leads me to believe that this is because there is a 500 file limitation on how much a folder on this device can hold, so they have gone this route. The player also has an LRC folder, for lyrics, but I have not experimented with that capability.
As I previously mentioned, navigation is done through folders, and within a folder, you simply skip through to the song you want with the scroller. You could set up folders according to album name, or artist, however the MuVo does NOT have any capability to let you browse according to ID3 tag information in the files. (you can create up to 3 subfolder levels deep from the root of the player) This may be a drawback for some people who like using ID3 tag info.
The design is almost the same as earlier MuVo's. It is about the size and shape of a cigarette lighter, with a removable USB flashdrive, which is the player itself. The larger portion of the player is the battery compartment. Compared to the earlier MuVo's it is more squared off, where the earlier model had a tapered appearance. I think I prefer the looks of the earlier model, but it a minor thing.
The controls are laid out so that everything can be operated with your thumb (for a right handed person, anyway) while holding it. there is an on/off/pause/play button on the face, and on the side are volume controls and a multifunction scroller/selector button. On my older MuVo, I thought the scroller might be a flimsy, breakable item, but It's had no problems in 3 years of daily use.
This model does not have an FM tuner, but that is not something I care about on a device like this. It also has a voice recorder, which I also do not use.
The player also comes with software to rip cd's to digital files and automatically load them on the player, though I have not used it. My preference is to drag and drop my music onto it with the computer.
One last thing. As with every other MP3 player I have had, the included earbuds leave something to be desired. For about $10 for an aftermarket pair, you WILL notice a difference in sound quality