I have a neighbor here that runs one.  He is happy with it but our toughest thing here would be beans with green stems.  I don't know how that would compare with canola, never been around it.  Neighbor just put a 30 foot flex on his this year and as wet as we are he has been covering acres with it.  Local dealer here has one on the lot with a completely rebuilt rotor in it.  I saw it when it was apart being rebuilt and it looks to be a simple design.

Gunner