I remember in 1997 getting a 300Tdi as a courtesy car while my SIII was being MOT'd. Whilst it was obviously a far better vehicle in every way and had all the things I dreamed of putting on my 109 - turbo diesel engine, power steering, coil springs etc, I was used to the SIII and strangely, did not enjoy driving the newer vehicle as much as my old one. I missed the completely vague steering, the cart spring suspension, even the lack of grunt and the truck-like gear change; but I knew that if I drove the Tdi for a week I would probably not want to go back. It is all about what you are used to.
We fitted a slick shift to my son's TD5 D90 a year ago and we both like the change. It is still a Defender, it still feels and drives like a Defender. It does not feel like a modern hatchback, the gear change is shorter, more precise, but totally in keeping with a Land Rover 25 years younger than my old SIII.