Thanks James for your reply, after receiving some feed back on here I feel more comfortable now about having it done tomorrow, I will post my findings soon, & thanks again for your input :)
I remapped my old E90 320d, it was the 2006 163bhp/250lbft version of the engine and after it was 200bhp/295lbft. I was very happy with the results, an extra 2-3mpg was achieved and the torque increase was very noticeable.