had an inbred at 125mm (it was an older 100mm corrected frame), used to ride it with a 50mm headset to compensate the steering a bit.
I’m hefty and I did ~2′ jumps on it and it survived no bother. coupla dents from dropping it but fine.
I then got a 456 ebb to which I swopped ~50% of the parts from the inbred. I run the 456 at 150mm with the same short stem (other differences are alfine hub and UST wheels).
Now only doing ~1′ jumps/drops on it because I’m worried about the alfine axle, but still doing proper xc and trail centres with no bother. 456 feels more planted (arse heavier?) and is heavier to lift but it’s 32lb where as the inbred was 28/29lb.
I do need to sit a bit further forward on steep bits on the 456 to keep my balance right with the longer fork but it’s a thing of nothing tbh.
From threads I have read the inbred is sweet at 120 and the 456 at 140mm. I’ve never really given it a moments thought.