Hot Rod, Yes lot's of knowledgeable people on here and they're pretty good guys too. I currently own a 17 M2, and it doesn't tramline. But it does have some float in the steering wheel when driving straight. It's not bad, but coming from the dead center, solid, steering feel of the Z while going sraight, I wish the M2 had that.
Also, I gotta be careful of the little imperfections I mention on the Bimmer forums, many fanboys there just waiting to pounce on honest people
By the way, congrats on the Z!