First off I'm new to all this so be kind [noob alert]

Just starting to do my research for the best remap on my new Mk7 GTD DSG when it arrives (once past the running being period).
Do any of you have any recommendations?
I'm liking the ease of fit/un-fit of the Chipexpress unit and the price £395.
Are they're better units for a similar price?
I want something I can very easily de-activate when the car goes in for warranty work or dealer servicing (and that can't be detected).
My criteria is not necessarily out and out power but a combo of increased power, deeper torque and slightly better fuel economy.
Cheers fellas