Great app ... just installed it.
Rediscovering my own album collections with the Music lyrics and the You tube video .... great to be able to see the videos of the Blues acts which I used to listen to. Its a nice addition for when you want to be more involved in the music then just to listen to it.

I am using it over Wifi and the Youtube video are working smooth - no stuttering as yet .

A few points worth making ...
On the Album List view it shows only the Album name - wish it also showed the Artist name on the same listing.

The Back button on the top is too small for easy navigation - have to attempt it around twice before I get it...

I am loving it if only for the Youtube video and Lyrics addition so far.
Of course when I just want to listen to music (as at Office) I would use the regular Music player. But this is great for entertainment purposes at home or elsewhere ...