This thread proved too much temptation for me so I've bought and installed a pedal box too.
Fitting took literally ten minutes but Booth11's "how to" post was massively helpful, thank you Rebecca; it's what forums like this should be about. The hardest part was contorting my (middle aged bloke) body to get at the connectors. Also I'd recommend sorting some extra lighting (a portable lamp I suppose) in the footwell so you can see what you're doing more easily.
I've set it to "Sport" with 2 green lights and would describe the effect (on my GTI PP) as follows: it actually makes the car a hot hatch! It really livens up acceleration but without changing the refined nature of the car. A bit like adding a few chilli flakes to a mild curry, if you like.
I imagine things vary with your driving style; if you are habitually heavy footed then you might not notice much change, but I'd thoroughly recommend this gadget if, like me, you're usually gentle with the accelerator. For £156 delivered, it's a no brainer.
Over the next few days I'll have a play with the various settings. Does anyone have any views about City vs. Sport vs. Sport Plus?
Bubba.