Syncros no point in the rest.
Me yes, I suppose the only other to have at the time was the Answer A-tac.
Both top notch, good looking stiff & light stems
Ringle Zooka stem was a neat looking stem in the same league and had the tidy removable faceplate.
The one thing with all three is they do not suit some bikes and the ControlTech tended to fit the bill a bit better sometimes.
You mention ibis, expensive Ti and not quite right looking to me.
There where of course more expensive stems made from Ti, but I don't and didn't see the point.
Cheers man, as I do like Syncros, and have a Syncros Cattlehead and Cattleprod on two of my bikes and do like them, especially the Quill one.
But I didn't realise they were top end
I also like the Pace stem and Ringle Zooka.
The Ibis Ti looks like the Controltech - but nicer finish.