So SONY finally decided to update the broken link, WOOHOO!
Upon first impression I have noticed ICS is works smoothly on the dated hardware. The RAM appears to be a bottleneck however, when after opening several links the system hangs briefly.
I noticed the music player gestures are less accurate on ICS, where it takes more effort and precision to swipe the corner to change the layout.
My system has more storage freed after ICS, roughly 1GB.
I appreciate the refined UI, though there are still quite a bit of bugs. The indicator menu still is problematic, sometimes it will not feed the song information / controls. The problem also extends into the Walkman classics app that was added.
Battery life seems to be improved while listening to music, though tends to drain faster while using the screen.
Anyone notice the sharper image after the ICS update? The ppi settings on GB were not optimal, everything looked a bit blurry. With the darker theme, the poor viewing angles are more difficult to distinguish.
The Walkman Z is very musical with my A900X, really enjoying it!
Wish I could find a fairly priced case / screen protector, not paying $30 for PDair quality...