Overall my luck has been pretty good except for one notable exception:

1984 325- nothing
1992 325i- only had to replace a window lift motor
2000 M Roadster- nothing
2002 X5 4.4- nothing
2006 650i convert.- entire top assembly replaced; entire CPU replaced
2008 X5 4.8- two AC vent tabs replaced; torn leather as result of fixing vent tabs; end stage resistor; blower