Have not run 800 but have run 500 and JD 920 heads. I felt that both fed inadequately in short soybeans. Both heads actually limited the performance and capacity of their resepective combines. Have run both heads with Johnson rockguard_grainsaver and it helped feeding and reduced losses at the head and even the back end of the machine. They help a lot! We now run Crary Air Reels. We've very pleased with this investment. They are awesome! I realize they are a big investment when installing on an "old" head. However, I highly recommend purchasing one when ordering a new head. A friend of mine priced an new 830 at my local dealer and it was $2416 extra to install Crary Air Reel rather than standard reel. In my book that is just a no-brainer. If one cuts any acres at all you will easily realize a double digit return on your money each year. I firmly believe that AGCO should buy Crary or make a "deal" with them to make air reels standard equipment. We've had one of our air reels since '89 and have had no serious troubles either.