I have a RTR05 and think it's a great tiller. The reversing tillers I think do a better job of chopping up the soil. I've also found that since mine tends to push a pile of dirt in front of it, that it's usefull for filling in small ruts and holes in the ground.
The bad part of my reversing tiller though, is that they tend to jam on rocks above a certain size. A forward till I think would just skip over a rock, but the reversing tiller wants to push the rock ahead of itself, where it will try again and again to pull it up into the housing.
I use to have a shear bolt interface, but ended up spending the money to get a slip clutch interface for the PTO. If your operating in semi rocky soil, I'd suggest a slip clutch on the PTO.
Otherwise, I love my Land Pride RTR tiller.