There are 2 different things, extended maintenance and extended warranty. The former only covers maintenance. If a window motor went out or the transmission you'd need the latter or you'd be paying.

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1980 633csi (Retired 1985)
2005 325i (Retired)
2006 Z4 3.0si (Retired)
2008 135i vert (Retired)
2009 328i vert (Retired)
2011 335is (Retired)
2011 Z4 3.0 (Retired)
2012 328i Coupe
2013 M3 Coupe (Retired)
2013 650i Coupe