It all comes down to the dealer being to lazy to call the area rep. These reps get paid to let LCO's demo. They also get commission if the LCO buys the machine because of the demo.
As far as decks go I have never had two decks cut the same in northern turf. IMO its the hardest to cut wet and fine fescue is the hardest to lift and cut clean. Very few decks cut good here. I do see how some would think bermuda is an equilizer. If its the grass I think it is its just like cutting crab grass.