I paid $6,000.00 late last Fall (2012). I think they were going to charge $500.00 more for the Ecolawn Model 200 (two discharge wheels) than the Ecolawn Model 100 (single discharge wheel). For the money....it's better to get the dual discharge wheels (Model 200). It can spread heavier material more even than the single discharge wheel.
I ended up putting on a rpm/hour meter on mine. I will have to get a picture of it tomorrow. Drilled a hole in the arm and placed the meter towards the top handle. Ran the wire down the handle to the spark plug. It turned out looking really nice!!!
I also put two tubes in the large tires...one side kept getting flat....so that problem should be fixed now!