I just retrofitted the 2012 idrive in my 2009 x5 that had the older CCC based idrive.

Certainly the navigation looks 100% better, the maps more detailed and the system faster to respond all round. lots of additional options ... 3d building rendering, satellite view, split screen with different scale maps /views in each pane, etc.

However if I was completely honest both systems navigate you from a to b pretty much the same way. Both systems tell you to turn left, enter freeway, etc ... So you don't get lost.

The question is, for the saving you make, can you live with the older system. Only you can make that decision :-)