No problems with 2009 iDrive, over the years, read negative upon negative review of iDrive. Enough to scare one away, but all in all, I have found the functions within iDrive to be easy to use and intuitive.

In day to day driving, the most I use it for is audio controls, telephone, and once in a while Navigation. Between the programmable steering wheel buttons and iDrive control knob/wheel, I don't have any problems. As far as climate adjustments, I'm not riding down the road trying to change how much air comes out what vent, etc., besides, there are dash buttons for that anyways.

The previous generations iDrive probably does have functions that aren't necessary, or could be easier to access (perhaps addressed in current iDrive, haven't worked with it yet).