I keep rubbing the grip on something and changing the EV compensation.
Where I'm continually flipping between landscape and portrait, it's a nuisance to have to switch the second control set on the grip on and off - but it's necessary to prevent shots like this where a -0.7 compensation was set without me noticing.
With the Canon Pro bodies, the location of the front control wheel makes this kind of problem far less likely.
I suppose this is the small price I pay for having a camera I can lift and use until I recover from surgery.