Ok my firmware is version is 28.1.00 ... I fear a bit the beta is it enough stable ?
In my experience, the beta versions are stable functionality-wise. The problems are usually small and cosmetic.
If you like to see what features are gradually added as time progresses, try betas. But if you are happy with your current stability, there's no need to upgrade.
In fw 1.00, music support is pretty poor. You notice the warning message when you try to play an mp3? A proper music player was not integrated into the firmware at that stage.
Don't hold me to is, but I believe that a new official firmware release will be out in a few weeks.
-G