It has some big advantages over mspot. Such as:
1) It stores high fidelity versions of all your audio files. mspot converts everything to 48k.
2) You can use MP3tunes as a backup/sync program on all your PCs.
3) It support iTunes playlists
4) You can get up to 10GB locker for free
5) You can get up to 200GB locker for pay.
6) Works with lots more devices including Apple i devices, Logitech radios, Roku, etc.
7) Also stores your personal video files.