I bought a DTUK box for a 2.0 Dti Vauxhall SRi a few years back.
It did feel quicker, but within 400 miles the engine management light came on, it had filled the DPF. So I took it off, went for a good long thrash to burn out the DPF and sent to box back.
You managed to get a reply? I've just gone to my credit card company about it instead.
Performed some logging on it today with results as below.Just fitted a DTUK box to mine and it's knocked 1.5 seconds off my 3rd gear 2000-4600rpm time.