I don't have it personally, but the foot wave one is actually pretty nice when your hands are full of bags or such.
Personally I am not a fan at all of the electro-nannies these days; adaptive cruise, blind spot detection, an lane departure warning among others... They are going too far towards not bothering to actually drive your car now.
I've seen people sitting in DC traffic reading a paper or a tablet, not even looking at the roadway and letting their car just follow traffic thanks to these systems...
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