Is there any reason you couldn't change the name of product you are applying when you change tanks? I guess being a liquid and dry guy I don't care when I fill. The load feature would be able to tell you how many tanks you've used.

http://salesmanual.deere.com/sales/salesmanual/en_NA/ams/2009/feature/gs2_rate_controller/allows_multiple_ops.html

With all of the stuff that is becoming ISO compliant I sure wouldn't spend money on an Insight.