I owned an XP50 and a QS8. The sounds and features of the XP50 far exceeded the QS8 IMHO. Of course the Alesis had a weighted 88 note keybed, but that was it, for me. The QS8 has a very woody sounding piano and the rest of the sounds were equally uninspiring. On the other hand, the Roland sounds were excellent and very editable. The sequencer and loop recording features were top notch.