Pretty funny video.      HP didn't show the long boot up time, or warm up time.   They also didn't show the carriage belt snapping off in the middle of the print. 
I print double sided prints all the time on the roland.   It's pretty simple.  Definitely not as simple as the HP, but that video was more comedy than accuracy. 
I like the HP for the innovation, but it's not there in terms of build quality for my needs. 
It would be AWESOME if Roland incorporated an OMAS sensor.   One thing I really dislike about my Roland is manually adjusting feed calibration ALL THE TIME.