As a DVD player I don't have any complaints about the Sony. As a changer it doesn't measure up to my expectations.
I have had a Sony 5 CD, 50 CD and for the last several years a 300 CD changer - the CX860 has had more misfeeds than all 3 combined. (A misfeed is defined as failing to load a CD or DVD, the unit then flashes an error code, opens the access door and powers off. Turning the unit back on can in some cases result it attempting to refeed the disc, which may fail again...you get the picture. I have all my gear in a glassed in cabinet which further ticks me off since there isn't room to open the access panel so when a misfeed occurs the access panel is only partly open and I can't reach the supposedly stuck disc.)
In my opinion the DVD folks at Sony should hire some of the Sony CD folks and have them handle the mechanical design.
The Pronto with SuperNudelist, of course, makes the unit useful and as long as it doesn't misfeed you will be happy. As others have noted the CX860 GUI is slow, poorly designed and the Pronto means you can mostly ignore it.
See
www.audioreview.com for several owner reviews (over all rating is low due to the same factors noted in this thread).
I have purchased Sony gear for years but I doubt I would buy another DVD changer until I was convinced that it had been redesigned and the GUI was cleaned up. I do intend to buy another Sony CD changer as they do work fine.