What is the most frustrating, I think, is the split in who was offered the free upgrade. I had Plus, so would have had to pay for 2.0 anyway. But because I chose to use a GApps address with Insync instead of using Gmail directly, I don't get the free upgrade offer. Not everyone using GApps is a corporation.
In hindsight, it was stupid to use a GApps address, but there's no way I could have known that because Insync made no differentiation between the two until you launched Prime. So I'm punished for that decision. It doesn't feel good.