QGIS really is an amazing program. The only reason I don't use it to store my yield data is that I haven't found a quick way to filter data. I primarily use Easi Suites for yield data storage. I use QGIS for everything else including zone mapping, RX's, topos, multi spec imagery, guidance line creation, you name it. 

One cool trick I discovered w/ QGIS is how easy it is to preplan guidance lines for field operations. I will load these guidance lines into our trimble monitor and poof... hands free headland turning. Only time i touch the steering wheel is at the start of a new terrace. 

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