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Both of those changes will lower the sprung mass and roll center of the car, so in theory they would help handling at the limit on smooth pavement. However, depending on how you go about lowering the car, you might end up riding the bump stops more often in high lateral loads or when hitting bumps on even moderate loads, which would cause a step function in spring rate which will immediately loosen whichever end hits the stops first. That would be much worse handling. So to lower it correctly, you have to increase the spring rate to prevent bottoming out, which can actually hurt handing on less-than-perfect surfaces, especially if the dampers aren't modified to match, all while giving you a worse ride.
As for spacers, they're going to put more stress on your wheel bearings, so you have to be extra vigilant about checking them, although a few millimeters never seemed to make a difference on my cars.
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