The 'cheap' tuning boxes basically fool the ECU into thinking the engine is cold and puts more fuel in. I tried one, and it did feel quicker, but more revvier rather than out right performance increase. But when the engine was cold a very light throttle made it jittery and jumpy and when warm the idle was lumpy. Plenty have said they are good, but I sent mine back. A good remapper should charge around £225 for 180bhp for a 130 model, so about 160-170bhp for the 110 model I think.