I forgot to tell you that I prefer voith to ZF CDGEs because
they are less noisy.
Voith preference count- SMRT CItaros(I also like SMB136C, not
the PB ZFs), Volvo B9TL WEG2(must drive faster, transmission will
be nicer), Volvo B9TL CDGEs(voiths less noisy), Volvo B10M Mk4
DM3500
What's the reason that you prefer ZF CDGEs?

Faster acceleration..
Those CDGEs can be heard from 14th floor at my former house last
time.. 
But for Habits, voiths are better. Try TIB1218R, quiet engine plus
smooth gear change..