@ElmerKTM Thanks for sharing your first impressions.
I also found a improved rear grip after installing my Quaife ATB , moving up from an OEM Open Diff (base model V6).
Usually the V6S model F-Types with OEM LSD perform better than the Open diff cars, and act in a similar manner as the Quaife ATB.
I am wondering if your OEM LSD with failing clutch discs provided any LSD benefit, or if it was defaulting back to an Open Diff.
Either way, it is great to hear that the rear diff upgrade kit + special tools worked smoothly with a 1 day shop turn around.

I recently participated in a JCNA autocross and was able to drop my times by about 5%, some of which was due to the Quaife ATB.
(other contributors were the ideal weather, accumulation of experience on this course, and new Pilot S4S tires).

Onca Engineering will consider making a new batch of Quaife ATB units if there is interest.
The applicability chart is still under development...

Application Table Quaife ATB for Jaguars with DANA AdvanTEK gears.