I have now fitted the Maxton side skirts to my GC and very pleased. On the advice of Des at Banshee I opted for the gloss black finish and IMO it blends in perfectly with the Nero paint and looks very OEM spec. They do protrude slightly more than the OE spec skirts on the S but def make the car look lower and wider on the road.
They came with fixing screws but I opted to change these for hex headed black self tappers with built in washers so I could get a really tight fit using a socket on the head. Also put some 15mm wide 3M tape on first to hold them in place whilst I drilled the holes and fitted the bolts. You just drill and screw into the plastic underside of the OE sill covers so no drilling of the metal and risk of causing corrosion.
Will think about the front spoiler and rear diffuser but don’t want to wander too far from OE look and make it too “bling”.