Engine performance upgrade chips

[flyboy]

On my previous beloved Mokka (Diesel) I had a kit from DTUK that enhanced the engine output., basically remapping the engine computer to override what VX have programmed in order to comply with the car's certification.
This option however can be used only when your warranty is finished because the manufacturers don't like people messing with their settings.

Now that I'm driving a petrol, I was wondering if the same option exist for the Grandland, and I found something on Amazon that might do the trick :

http://www.amazon.co.uk/Sprintchip-Gran ... Grandland

This one comes with various options, Obviously the one that gives you the highest power option is the most expensive.

I was just wondering if anyone has any experience with this company (Sprintchip) and generally what are your views on car performance enhancements...