Got my Ti knob today, thanks Phil! Initial impressions:
It's much smaller than I thought.
It's actually quite ugly.
It doesn't fit very well in the hand.
Whilst sitting in my driveway making VRRROOOOMMMM noises and shifting gear, it does seem to give the more positive action I was after, which is more important to me than any of the above.
The other thing, which I'm going to have to fix else it'll drive me mad, is that the knob sits a fair bit higher than the stock one (approx 10mm) and so the leather boot doesn't mate up to the bottom of it, and you can see the ugly finish on the top. I think I'll have to go searching for some kind of metal trim ring for it, must be somewhere on the interweb that sells them.
So far, I'll give it 8/10 thumbs up.