Ive just been to Paramount performance in Slough today.
Basically I bought the V switch as I have a Jeep with the same V6 as my 120 Cdi has and they told me it would work on both vehicles and read the fault codes on both vehicles. It turns out they had made a mistake and to compensate they offered me a free re-map on one of the vehicles. As the van is used most I have had that remapped and the V-switch changed to work on the Jeep.
I don't know what mpg Im now getting but by the end of tommrow I will know as I have a 350 mile round trip to Grimsby. But the van is pulling a higher gear, accelearting faster at takeoff and at motorway speeds.
Paramount have offered a special deal for a limited period to anyone on this forum quoting my username (top Cat 2006) It is that a normal remap is £350 + VAT on top (£402.50 total) but they will do the work for £345 including the VAT. They can map the vehicle to achieve whatever you want (more power, more economy or a mix of both) They have a rolling road so can also produce power maps and torque curves) (couldn't put mine on cause it was auto and also the traction control does not turn off fully)
They can also offer the V-switch which the advantage is you can have two maps and switch between them yourself and also it has a built in OBD reader for £399+VAT on top.
There phone number is 01753 533633 and you need to press option 1 and speak to Gerald. Web is Paramount Performance Ltd - Engine tuning, Chip tuning, Diesel tuning, Viezu Technologies
Give them a call or drop a line as they are only too happy to talk to you and find out what you want and how they can help.
I hope this helps and hopefully some of you will benefit.