Lol. There is always bigger and better. That's why I said this is the best "in-class" auger. As mentioned, Yes, a bucket mount would be better as it has down pressure etc.
With the price difference, its really not worth it unless going into business drilling holes. Unless you have tons of holes to drill, at the cost of the upgrade you mind as well just hire someone else to come do the holes and it would be cheaper AND easier. He got a great deal for his setup.
As for my experience, I've drilled through hard packed dry clay that typically requires a pick ax to bust. With hat sad I am not familiar with other hard packed soils in other areas. (Rocky etc).