Well I just got home after running the update in my work car park.
It's much better now, although I wasn't complaining before. Feels a more agressive but equally smooth and also clearly boosting more strongly than before.
Phil I do have the 50% or whatever it is thing on. I think I am going to turn off the fuel one and change the oil guage to show boost.
Do you guys all have the 'flash' to show that the car is warmed up? Instructions say it is based on 160f I think and it appears to happen in my car when the oil guage is still showing more or less cold. Does this truly indicate that it's safe to begin pushing the car a bit harder?
Otherwise I am really liking the JB4's features vs the old JB3 - its clearly miles better and for the money, its a great bit of kit.