The horsch drills dont have any front coulters, so the front packer/tyres dont tend to get dirty.
Converting to duetts is an easy job - problem is that simba are wanting a fortune for official parts. I think 2 years ago they modified the duett coulter, and replaced a lot of origional ones. I enquired about a set of 16 of the old ones that they were going to chuck, and they wanted about 6 grand for 16. I reckon it cant be hard to build my own, although maybe something more like those on a claydon with the A points.
Simba are actually getting a lot of enquiries for s/h freeflows. I like the horsch, but as I picked up a mint 4m freeflow for under 5k with new rollers, spending over £30k on a drill is expensive! Thing is I now have a very big tracked beast, which would look silly with 4m behind it. They also make good trailed cultivators if you replace the drilling coulters with rigid tynes.
One of our freeflows has the 'standard' coulter points. The other has the longer points from the miniflow - the ones that can be turned over, along with the matching boots. These are skinnier in the soil.
My prototype is on the sketchpad - not yet in the workshop, as I thought I could make them spung on some vaderstad cultivator springs, but I dont think they will fit onto the steel sections. *scratch head* Certinaly with diesel the price it is, I am keen to keep the cultivation that the freeflow does, but cut the draft so I can get 6m behind the 260hp crawler at pace.