I have quite stable mp3 playback with Delfina Lite... I don't remember that delfmpeg would have crashed even once, but got some rare lockups with AMPlifier. Those might be for any other reason too as they usually happens when you've played music whole day or so.
I have hw overclocked Lite... I'd guess it is 60MHz, but can't remember for sure. I also have
DelfInit to replace original initialization program in user-startup. And also Henke's delfina.library
patch in use.