Actually, the 2366 and R52 are both class 5 combines and are comparable. Both are reliable machines, but the R52 has the better cleaning system and will hold up better in the long run, what I would call durability. If you're asking either of these machines to do 5mph in 200 bu corn with an 8 row, you're probably expecting too much. That said, you can certainly run an 8 row on them (the R52 has the stronger frame and feederhouse to carry that header),but at a slower speed. R52 would be more friendly to work on as well. The R52 would outdo the 2366 in small grains and soybeans and I believe would be nearly a dead heat in corn.