I disagree that a genuine Swiss movement will not make any difference in the reliability of the watch, I would argue that it is the single best upgrade you can make. I'm talking about sourcing a genuine Swiss eta not the "Swiss" movements that some reps come pre fitted with.
I guess it depends if your rep is considered a timepiece first and jewelry second, or the other way round.
The Asian 7750 is pretty decent movement but there is simply no comparison to a genuine Swiss movement. It is recommended to service a Swiss movement at least every 5 years. You'll be damn lucky to make an Asian 7750 last 5 years without a service, my last one managed 2 years before curling up it's toes.
In fact in 2 years my SA is on it's 3rd asian movement and the chrono hand slipped on that pretty quick and the reset arm slipped out of place. Compare that to my 20 year old Swiss watch that has never been serviced and still keeps perfect time.
No doubt a gen proII is a thing of beauty but my reps are time pieces first and jewelry second. I won't always want the full bling, sometimes I'll wear it on rubber or leather, but I'll always want to know the right time
