If you want to overtake with minimum risk then yes.
And if someone else who isnt paying attention pulls out on you whilst you are undertaking this 100MPH+ overtake past 4 or 5 cars? Which based on my experience of driving standards isn't an unlikely occurance.
I understand the idea of the faster you complete the overtake and less time you spend in the oncoming lane the better, but at 100+ I think the risk of not having enouh time to react if someone else does something stupid outweighs the benefit.