Whoa... 8" rocks!

(I won't be dropping my tiller off at your place anytime soon..)
I've got a John Deere 660 tiller. Forward rotation and slip clutch. It's stored outside on a pallet and double tarped. Never a problem with the slip clutch. I think the clutch is a better safety feature and helps to avoid more costly damages whenever you encounter situations that are unforeseen; like 12' of buried 3/8" chain! (Maybe that's worse than an 8" rock..)
Interesting info regarding the advantages of a reverse tiller. My next tiller could very well be a reverse machine.
AKfish