It would be good to see one in real life but there are no shops near me. Generally battery grips are seen to be poor value for money for what they are. The 24-105 and 70-200 f4 feel like they balance well on the A7RIII but the 100-400 feels like it could do with a little extra weight on the back and increased grip size. It does seem to be counterintuitive adding more weight to the camera when the camera is so small and light.
Does it help the handling? I’m guessing it feels better especially with the longer grip. The additional battery could be very useful.
I’m looking forward to giving the 100-400 a run tomorrow. So far I’m impressed with the feel/handling. I like the smooth/tight option on the zoom ring, just wish there was a lock option too. I’ve very impressed on the closed size. It fits across a small F Stop ICU which is fantastic for me. Looking forward to smaller bags and less weight