Mine works from about 50ft at a 90 degree angle. I hit the opener as I'm passing the house and do a 180 to get into the driveway. The door is opening. I've never tested the full range but the ones on the mirrors seem about the same as the older roof mounted.

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Richard
Sir Snaps-a-lot, 9 Time Dragon Slayer (54 runs!)
2011 X5 50i Alpine White, Biege Nappa /Lt Poplar M Sport
2009 Z4 35i, Black Sapphire/Ivory-Black/Anthracite

Gone but not forgotten: '08 550i, '06 X3, '06 650i, '02 M5, '99 540i