It's a non issue for me. I know on my 975 that DISC is the PS3 and TV is our Roku, for example. The fixed names aren't perfect but by and large they're close enough. Also, I just program our trusty MX-700 remote and once that's done I don't NEED to remember any more as it all happens automatically when I press the button.

I know a lot of people feel it's important to be able to rename the inputs to read whatever it is they want it to display, though. I personally wouldn't pass up a great piece of gear if that were the only sticking point because, for me, overall performance trumps an arbitrary label.