BEcause i edited it because i thought it was wrong of me to say what i said, but now that your also being a complete moron, i will repeat myself. You really do speak some XXX you know that.
Being smooth is probably one of the only good traits of the voith, ive heard complaints from only a couple of companies about voith gearboxes, namely because there are not many operators with them. But specially with the older ones which i know more about, there seem to be a lot of reliability issues, not to mention lack of power, making the engine work harder which would shortern its life, and high fuel consumption.
Apart from that with the same ill maintenance given to most ZF's because of how robust they are the voith an become quite a thumper also, I have experienced it.
With the zf it has a lot to do on how the box is mated to the engine, back in the days of the O405 they were some smooth ones and with age they tend to get rough, even worse when services weren't kept up, but then the B10BLE's and L113's were as smooth as silk with continued servicing.
Bring the picture to the present and out of the many O500LE's I have driven I cannot fault the shifts of the gearbox, you never feel a thing, the volvo's can get rather thumpy but this is what happens when you pump a rediculous amount of power through a gearbox that is barely designed for it.
THe only problem I find with the ZF these days is sometimes they lock up to early and can jerk around a bit when you de-accelerate, this can also be programmed out of and they would follow what the O405NH's and L113's do(which is drop straight frm hydraulic 1st to hyrdaulic second then lock up, and extremely smooth action)
It is the voiths long semi hydraulic first gear that makes it so fuel ineficient. There are many pros and cons to both gearbox so I don't think it really deserves the merit that you are reaving on about it for, I stil think the ZF is the better gearbox. With the new ZF 'ECOlife' transmission coming to a bus near you soon, i think your opinion will also change, with new shift patters, a newer smoother torque converter which is also good for transfering 30% more power and a 10% saving in fuel.
Proud Volkswagen Golf owner...
Mercees o305g:- one of the best buses ever built