Comentário oficial
I take reviews of anything with a grain of salt.
What kind of computer was that DJ using? A 10 year old Windows 8 machine? Brand new MacBook Pro? How did he have it connected - a no-name USB hub? Was his computer running and update at the time? Were all of his drivers up-to-date? Not just the Pioneer DJ drivers, but other system drivers?
So many variables.
But that said, if I could be completely honest with you, I'd suggest you consider another product. The XDJ-XZ is superior in so many ways, yet offers some features that creep into DDJ-RZX territory. No, you won't get the full preview displays, but it's less expensive, lighter, and can operate in stand-alone mode.
Give it a think. ;)