I've got them and find them useful, and not a gimmick. They've saved me from standing in something unpleasant in the dark before getting in the car and trampling it into my mats!

They also do a good job of providing just enough illumination when getting out of the car in a dark garage, if I've forgotten to pull the indicator stalk to activate the coming home function.
I got the luxury pack primarily for the folding mirrors, as my garage isn't the biggest, and folding the mirrors give a bit more clearance. The puddle lights are an added bonus.