I know Andrew at DTUK well and his fiancee Jen also. These boxes are superb, they're not the cheap resistors that everyone brands them with like off ebay for £5.....
They had a CR FR about 2 weeks after they were first released and ran a box on it, CRD-T i think....saw some fantastic results, went out in it as well and the difference is unreal.....
as mine is the PD engine there isn't a box available so had to opt for the remap. but i'd choose a box over a map every day of the week, purely as they yield better fuel economy as well as bhp & torque figures....95% of remaps won't give you that. So it's a no brainer, buy a box, and get 4-5mpg more than you are, and extra bhp, so in a year or 2, you'll have paid for the box with the money saved viaa fuel economy....No argument really.