PML recently quoted me $740 nett for 2012 map undate for my FL E90 with CIC iDrive. It used to be $800+. I am still considering whether to do the upgrade when I send my car for servicing in a few months' time. I was told I need to order in advance for Germany to send them the code to unlock the software.
my E90 LCI M3 updated at soundwerks has traffic alerts but... not very helpful la...
I've only had it for less than a week but have found that if turn on the traffic info and look at the hotspots BEFORE you set off it sometimes helps. The slow downs are marked on the 2D maps in various colors and you can try to avoid these roads if you have reasonable alternatives. You can use the idrive dial to zoom in and out. You can't really see the markings on the 3D perspective map. It's mainly to look cool unless you're using the guidance.
I am sure the guidance can route u to avoid the hotspots but nobody uses the guidance for going home from the office (except the first week after you collected your car )