Good to hear.
If set up and tuned properly, there should be no hesitation.
To be honest I have never heard that.
In fact most comment on just how responsive and smooth the throttle is compared to carbs.
I doubt it's much more then tuning the accelerator pump (AE for TBI).
Vortec or TBI doesn't really make a difference.
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Bill at Hamiltonfuelinjectiondotcom