Pioneer XDJ-RX2 & XDJ-R1

Hi!
I want to ask you about Pioneer XDJ-rx2, I suppose that some people on this forum are a users of this equipment. Can you talk me something about weaknesses and assets of this equipment?

Actually I use to playing Pioneer XDJ R1, and I want to ask you about crashing of the firmware while music is playing. Yesterday I have that situation in one of the places where I have been playing. Have you ever have the same situation with this equipment? What can be a reason of this crushing? I have used this equipment for 6 years and this has got a place first time.