I found that the reflectors went soft after driving in the heat and left loads of glue when I took them off. Nothing a bit of far removed couldn't sort with a quick squirt but that may have been to do with mine being cheap ones off eBay
They don't change the beam across, they only move a shutter to block the light directed to the left. Resulting in lower light output and no 'flick' to the right like you would find on a LHD car. Still better than the stickers though!