Hello Chuckie,
To compare the DVD-V7400 to I've used several other CD and DVD players as well a Pioneer Laserdisc transport for comparison. All of them were sold off once the DVD-V7400 took over. We also currently have a Marantz UD5005 Blu Ray which I can use as a transport but I prefer the Pioneer.
You have to remember that the DVD-V7400 is commonly used as an industrial high-reliability DVD player. It will be installed in mobile setups that get moved to conventions, shows, or displays. Failure will of course come if one has been dropped or subjected to an otherwise torturous environment.
For those of you buying these second hand remember that you will NEED either a remote control and a video display or some other method of controlling the transport. We use the video display on our Fosgate FAP-T1 but if that was not an option then we would use an external video monitor. Take time to read the manual because there are several key features and capabilities that you may not know about until you read the manual.