The proper term for the dished style colter is called a jointed colter. The jointed colter from what I have seen works very well. Side by side we have ran jointed colters without cover boards &amp; streight colters with cover boards in both sod busting,&amp; heavy stocks &amp; trash &amp; the jointed colters put the cover board regular colter to shame. you can just see the jointed colter start to roll the ground over way before the mold board even comes close to it. We have never had problems with plugging with the jointed colters eigther.The neighbors with the very same plow as us with regular colters have watched us busting sod with our jointed colters and were just amazed at the ground speed we could travel &amp; have the sod roll over so smoothly,lay flat &amp;  with no plugging  They finaly broke down &amp; bought jointed colters from a salvage yard for 150.00 each plus they all needed new blades.(more added cost) We have also had people say what a nice job of plowing when we use our 548 with the jointed colters and they don't know what plow we used. so I have to give the credit to the colter not the plow or the operator. But this is just my thoughts &amp; others may differ. I am just saying if it were me I'd take the jointed colters hands down!!