I bought mine about 4 weeks ago and only got round to having a play today.
before loading the new map i had a lumpy idle, a wierd drop off of revs when changing gear from cold (jolted like a sh*t gear change), and a bit of a flat spot at around 3k-4.5k
after loading the new map all of these have gone and the car feels INCREDIBLE!!! i went out for a play after doing it and i had the biggest grin on my face it feels like it is pulling so much harder through the entire rev range. it is a deffinate purchase, especially if your having some lumpy/cold start issues. Im chuffed to bits, didnt think it would make that much of a difference.