Kuhn GMD-77 disc mower

I'm looking at purchasing a used Kuhn GMD-77 disc mower and I want to know the good, the bad, and the ugly. I have tried googling this and the only specs I can find are for the GMD-77HD, so I don't even know how big of a tractor I need to run this beast. I have a Kubota L5740 that I've been using to mow with a John Deere 9' sickle mower, and it does a pretty good job. Mainly wanting the disc mower to "upgrade" . . . speed things up!

 

TIA

Kuhn GMD-77 disc mower