I salute you Frac

Ian C is another who springs to mind as someone who uses a 600 4, with extender, hand held
I honestly don't know how you guys do it. Anyone who says it's easy isn't giving themselves credit.
I don't want to put people off. You guys prove that hand holding is possible once you've got the knack. And the muscles. The results speak for themselves. And I think that for many of the situations where you use these gorgeous beasts, a gimbal or at least a monopod is no great hardship and makes things infinitely more manageable.
That's my plan for next year anyway, and those damn passerines had better watch out