i have the sitrex 9 shank tiller. It really is NOT a chisel plow. True chisel plow is huge, penetrates deep, and is extremely heavy. Some have guide wheels.
Anyway, my sitrex impresses me with it's design, strength, versatility (has both cat 1 and cat 2 pins, built tough enough for the cat 2).
I have been to many farm equipment sales. My sitrex "chisel plow" with the coil springs on each point, is built tougher than any other used old plow I have seen. Mine has shiny hard enamel paint, not powder coat. It has a metal plate describing what it is. the bolts holding it together are gold/anodized or whatever that is, and they are still shiny.
Bottom line, I would not sell if if you offered me what I paid. There you go. And my 70 year old farmer neighbor asked to borrow it...haha.
oh yeah, 2 years left outside in elements, still shiny red!