I've bought a Pacet version, yet to fit it though.
My 300TDi 110 stays cold in the winter, so fitting the fan will enable me to control the thermostat, enabling a nice warm cab, (that's the plan!). Also, when off-roading, I have already, (in preparation) fitted a bypass switch to switch it off thus stopping the spread of mud throughout my engine bay.
Just my pennies worth:-)
Ollie