i have a pa1x pro and it is a very decent piece of equipment, the piano sounds are good but it does not have a proper weighted piano action which is abit of a bummer. it is also abit out of date and the new pa2x is available but if you are on a budget and not worried about that then it is definately something to consider.
The interface is user friendly when doing simple things such as finding a sound and playing and also finding a rhythm etc but when you start to delve deeper into the electronics i found it abit baffleing.
Hope ive been a help