I hear all what is being said about no point in "tuning" the Oriel but if you go to the facebook page of Unichip and see the post dealing with the Oriel, there it will be seen a Oriel on the dyno with a picture of the graph of power vs speed it will be seen that there is a gain in the lower part of the graph of around 25HP. But at the top end the final HP is still 140. They also claim that the torque (more important than HP) comes in at a lower RPM as opposed to the stock torque that comes in at 4000RPM. This can be compared to the Turbo where the torque is rated at just 1700RPM.
According to this guy I spoke to at Unichip, If I am not satisfied, the car will be returned to original condition with no payment from me.