short version be that this be a nice mp3 player . expansion slot for sd , solid construction -lrb- battery cover be a bit flimsy though -rrb- battery life be long . etc. etc. . biggest drawback that negate all of the above be that they drm cripple the little thing . it be so nice up until you find out you have to use TDK 's proprietory UniFi software . which unify nothing . it `` allow '' you to copy mp3 from you system to it . and then they be dead . you can not copy they back , you can not transfer they to anything else . and here be the best part , Windows do not recognize the device unless you install the software . it be all the software as well , if you merely remove the sd card you can move and copy mp3 to it via a reader and the mojo play they fine . but obviously this do not work for the main flash memory . and you need the software to make it work ... so unless someone reverse engineer the program , do not buy this .