Sorry to hear about the problems of the new Onyx Android ereaders. I was hoping their new rumored large Android ereader would be my next one.
About the Android apps not working well with eink: You've probably seen this video
http://www.youtube.com/watch?v=L6JsCXPiDJU
See the special mode at around 8:00. I'd say angry birds works pretty well on it considering it's eink, so I guess that mostly static apps like gmail, news readers, etc. would work pretty well. Of course, if you've used an i63 you must know better than me...
Anyway, now I'm not sure if I should buy one of their linux based models