Here is my extremely consistent advice for this car: do not give anyone an opportunity to void your warranty. The car makes the power (or torque) it makes in part because of the transmission manufacturer. Absent warranty concerns, it could make more. The MkII makes significantly more power but it also is not subject to the durability concerns of the road car. I know a few transmissions have been replaced in road cars.
A replacement 7DCL750 is priced at $28,470.52 currently, with an additional $5k core charge. That is part price only. The process by which parts and service are handled is at best characterized as challenging, and can lead to significant downtime. Beyond that, without a warranty, the additional potential service and repair costs of additional components can be equally significant.
This is an extreme mischaracterization. Brooks did all that Ford asked to as an owner, and he hardly could be considered as bad mouthing them or the car. In fact, outside of Shmee, I would say absolutely nobody has done more to make the car look good than him. His content was excellent, unique and very flattering to the car. His explanation of why he sold it was eminently reasonable. He uses his cars - all of them. His concerns were completely rational and offered in an extremely mild manner.