The guys near thurrock was probably big boys toys.
I think all remaps offer pros and cons, I tried several differnt maps on the 1.8T and like the Oettinger conversion best as I feel it is more like the stock car - just more of it - there is no huge torque spikes or anythign that some tuners can give.
I'd look around and see whats on offer and try to drive a couple if oyu can before buying.