Yes, I traded my second SV-650 in for my Zero SR. Best decision I've ever made since buying my first bike.
I rode the SV-650 from 2002 to 2014 and I thought it was a light, awesome, powerful, agile, lovely bike.
Until I took the Zero test ride. Oops.
That was like going from a prop plane to a jet.
I still have an FJR-1300, which is now sort of a garage queen. On one hand, it's nice to have a machine that brute-force bores through the air at 80mph with a total disregard for efficiency. On the other, it's heavy, vibrates like hell, is ROASTING HOT - especially in the Florida summer, and boy, is the clutch a pain - especially in traffic.
I now think of my SR as my short-range jet fighter, and my FJR as my WWII long-range prop-driven heavy bomber.