[Colin McKay]

The Volvo I-shift has always been the one to have, far superior to others in terms of rapid gear selection. They also offer a twin clutch box which is all very nice, but at a considerable cost & weight premium. Apart from bragging rights the only real advantage is on the really heavy stuff or off road applications where the uninterrupted supply of power keeps you moving and is more sympathetic to the rest of the drivetrain. In normal road applications it's a bit OTT. As far as I know it's only available in Volvo's own trucks Mike, but maybe in Renault as well now? I think DAF and others have persevered with the ZF box and of course Mercedes have their own which I understand is much better now than it was when I last ran a Merc. It was because of that box (and Merc's inability to sort it out) that I never bought another one.