I have EDC on my car but it wasn't by choice (got one of the 3 remaining 2008s in Canada, EDC was included)... however I must say after driving with it for the past few weeks it is definitely something I would order again. The ride in comfort mode is noticeably better/more comfortable than my previous E90 325i w/sport pkg... the roads in my area are brutal but the ride is very smooth/comfortable and I've had many comments from friends on how nice it rides. Potholes/busted roads had not been an issue so for that I'm grateful my car came with EDC. The biggest test was my wife, she didn't like the ride in my 325i (especially with my 19" summer rims) but quite enjoys the M3... that is she enjoys the ride when we're putting around town. When I'm hammering the gas up to 8000rpm on an on ramp is a different story of course.
On the flipside putting EDC into normal/sport makes a huge difference in terms of stiffening the car up. Normally for spirited driving the normal mode is fine as I find sport too hard/jarring but we'll see which is best on a track (hopefully this spring at Mosport).