agree... having a live PTO drive independent of ground speed versus 8N ground speed PTO is a great asset.. As you probably know, ground speed PTOs and heavy bush hogs can be deadly if no over-run clutch is added to the PTO drive...

In my home town, a number of times I've seen news stories of someone getting killed bush hogging up close to ditches/steep slopes.. The inertia of the rotating bush hog is huge and can over power the brakes on a ground speed drive.. the killer accidents are when they can stop the tractor rollover in a ditch or slope.....

I even put a over-run clutch on my live PTO as the very heavy bush hog (rotating assembly) would really yank the drive train around (backlashing) when you closed the throttle a fair amount.

for anybody not familar with PTO overrun clutch...
http://www.ehow.com/video_4941613_pto-clutch-tractor-how-works.html