I just flashed my 5500 with it. My take on it ... it works ... but the built-in apps is kinda like a throw back to the dark ages ...
The Notes, Pictures and possibly other apps all do one *stupid* thing: They scan the internal and I think external media for the supported documents and present a "protected" view of available files. I think it may seem like a way to be user friendly, but when you think of how many files one can squeeze into a 1gb sd card (or 4gb sdcard ... I've not tested this yet), then you know it's going to take a long time!
Besides, users who choose a linux device, should at least know about directory structure to be comfortable in navigating through a browse dialog right? I mean, even Windows have that!
I might install some of the apps from the oz/sharp feed and see if they work. Post back later.