Haven't run one because they were too small for our area. But if they were anything like the 750_760_850_860 combines then you better run. You would be better off getting something more reliable such as a IH 1440, JD 6600_6620, or a Gleaner l unless you have small amount of acreage to cut that wouldn't give the 550 time to break down. I also think it is interesting comparing the comments you got on Machinery Talk as compared to the comments you are receiving on this board.