The HD took about three and a half hours to complete and install--including the front hitch. I encountered no problems following the comprehensive instructions. Incidentally, the frame of my '94 Grand Cherokee was pre-drilled and tapped to accept the hitch assembly.
I drove about 100 miles to deliver the rig to our cabin, climbing from 100 feet above sea level to 4800 feet. The rig handled fine with no shake or shimmy up to 60 mph. I didn't try any higher speeds.
I would suggest, though, removing the blade before long trips at speed because my jeep, usually a cool runner, ran up around red line on sustained upgrades, and I'm sure it was because of the modified air flow from the blade. I really don't see that as a problem since the blade is easy to remove and carry.
I really wish I could say how well the blade works, but we have no snow in Cal yet.