I have owned several Big Bangs through years and from time to time I would use the chronograph just to show others what a chronograph does, and to show off a bit
.
But nobody reccomends it, A7750 movements run strong on their own but using the chrono can lead to problems.
As a matter of fact my last Big Bang Black Magic after using the chrono like 5-6 times the chrono hand started to slip. It wouldn't reset at 12 o clock.
I removed the chrono hand and installed it correctly and this didn't resolve it. I even disassembled the movement and reassebled it again, and after some weeks the problem emerged again.
In the end I asked Domi to installed a gen chopard movement, and still I was afraid to use the chrono and sold the watch.
Long story short, in my experience I would avoid using the chrono on A7750 movements, and I would be careful even with an ETA7750.