I had a chance to visit the JavaOne Pavillion on Thursday. Couldn't resist to buy an RS Media, mainly because of the Java programmability. I had limited success with it so far, though. It starts a MIDlet from the SD card on startup, but this seems to run in parallel with the usual behavior, and everything is very fragile (which is also my general impression of the RS Media software).
Anybody else using it and interested in exchanging experiences?