If its £150 and reliable remap that has been tried and tested then at that price i dont mind if its not switchable really as well over half the price.
I know there are alot of arguments about these generic remaps but they are usually well researched before being sold due to the fact that if they cause problems then there will be alot of people coming back playing hell (not saying that a custom remap is not better as its setup exactly for the car, but that also depends on the fact that the person setting it up knows what the hell they are doing). Pros and cons to both sides if you ask me