Yup, I'm with you on this. Andriod on Sony Walkman is quite polished. I use my F807 everyday without any hiccups. My DX-50 crap out due to bad UI & stupid touchscreen too many times a day.
The DX100 is just bad, but to be honest the DX100 is more stable & usable than the current state of the DX50. No such problem with my Sony F807 running 4.01 though. You can always turn off other apps when not needed. Think the fluidity of iPod Touch UI, Sony's Andriod Music app is very near that level.
Edited by purk - 10/3/13 at 2:56pm