Finally I had the short shifter installed in my 997 Carrera S and the difference is pretty impressive compared to the OEM shifter but I'm not sure yet if I really like it.
It makes some pretty loud clanking noises when shifting, especially when shifting in the gears 2,4 and 6. And I always have the strange feeling that the gear didn't pop in completely but of course this is just a feeling.

I have to get used to it, I'm especially interested if faster shifting times can be achieved. My 996 Turbo had a short shifter too but it felt slightly different.
More on the short shifter in a few days, I just have to get used to it to be able to write a short but complete review.