I will say that the real difference is with the D10. I jumped from the D05 to the Wildfire 18 with out noticing much difference. Biggest difference on high bite tracks is a aluminum chassis plate. I don't split hairs but the newer Wildfire is reasonably competitive out in the world. I finished 3rd. at the Snowbirds VTA in 2020 (was Q2) and I am 69 years old.