Was a bit dubious at 1st to even contemplate using a plug n play device as an alternative to a full remap. Having read Alot of the reviews prior to purchase, they set my mind to some ease. Now having fitted it, wow, the difference is Fantastic. No more lag and the feel of plenty of power from my 520d BMW. If you want to save at least half the cost of a remap, buy it.
Thank you