I agree with the other posters that the Ag Leader grain yield monitor is superior to the GreenStar grain yield monitor (but not enough to let it be a deciding factor on GS2 vs. Insight).   However, across the customers that I have worked with, the Deere cotton monitor appears superior to anything else out there.  I'm not sure if the responses that you got here were really cotton-specific responses, and there is little in common between the grain and cotton monitors for either company.

Having said that, I admint that I have never seen data from an Insight cotton monitor.  Only from the PF3000.  At one time, the Insight wasn't available for cotton monitoring.  Is it now?

Here is a shot of four Deere pickers running in one of our customers fields, after two calibration loads on each machine: