Next spring would be a great time to do a side by side.  I did one a number of years ago with a 500 and a 7000. The 500 had 2 BPA higher yield then the 7000. So don't believe all the negative things you hear with the cyclo's.

I believe one thing that make people think there new planter is giving them higher yields, is that with their new planters, they are getting a higher yield average over the years. Well. with my crappy 955 my yield is also going up over the years also.  Maybe it has to do with the corn that you put in the planter more so than the planter itself (assuming you have a well maintained planter).