To answer all of your questions, We farm about 4,500 acres but we also do custom harvesting, chopping, round baling,square baling, planting, and tilling. We havent used the 1594 grain cart much but everybody love it. The fields in the pictures ran about 50 bushels and acre. We had 2 1084 brents and traded one off for this 1594 and it is a huge upgrade, worth the extra money but the 8430 is a little small on it. We had our first 9860 last year and I loved it until we put our 12r 30" Harvestec chopping corn head on it. After that the combine was broke down every other day and that is why we went to the 9870. The first day we had the 9870 we did some corn and it was a BIG improvment over the 9860 but since then somthing has gone wrong with the moter and it doesn't have the power that it is rated. Just today I was harvesting soybeans and a seal went out on the turbo and blew oil all over and then the turbo started on fire but luckly i noticed it right away and got the fire out before it did any damage. We have a new turbo on it now again and it is running good exept for the power problem. The command center is great,it tells you way more then the pillar gauges, I just love it. If anybody is wondering the picture of the 9670 is our second combine of three and it has 710/38 duals on it. If you are looking for floatation or less compaction go with the duals over tracks, way less money and I can drive through just as much mud as a track combine and it also makes a really smooth ride for cutting beans.