Received the X1 yesterday. I have to say, this thing sounds great. I used iPod classics in the last years (3 of them), which all succombed to a mysterious "stop while in your pocket even with hold button on" illness. The play and next track buttons all died before that.. I can only compare to those. The bass definitly is stronger on the X1. The direction of instruments is more easily heard, faint sounds that I couldn't hear before are now there, it just sounds better overall.
I searched for a high capacity ipod classic player and found a cheaper better sounding player. I have to say, contrary to what many here are saying, I found the interface superior. You can browse folders, skipping through a track only takes one button, you can always change the volume and quickly access now playing and even the album that is now playing. For me the screen is absolutely adequate, for that size and to my eyes the resolution is good.
The bad points are the track limit, but this is not so important to me as I have a folder structure library and prefer to search like that now anyway.
BUT, if it is possible some kind of scroll accelaration is deeply needed.
I just hope the buttons on this device dont give up after a year of use like the ipods..