Been offered a tdi tuning box for much cheapness, im not spending masses on the car so this is ideal!

Are they any good? Anyone had experience with these?

I've got one for my 1.4TDI. It certainly gives more power and torque. Maybe a little drop in mpg. The bad news is that it gives a lumpy tickover especially when cold and generally the engine is noisier, so, at the moment it is not fitted.. The torque makes a huge difference when towing a trailer and I'm toying with the idea of making it switchable.