Used that on my last Z4 for a couple of years. Works well and you don't need to look at what you're doing.
Now that the 335is has an iPod connection, I've opted to load up an old iPod with all my music and use the steering wheel controls. Better quality sound as well.
2011 335is Coupe 7AT, Titanium Silver, Grey - taking delivery 9/2/11
Past vehicles include:
2009 Z4 S drive 30, Space Grey, Black
2007 335i Coupe 6MT, Space Grey, Coral Red