I've been looking to upgrade to 20" for quite some time. Always liked 19" but the aggressive stance of 20" was hard to resist.
After doing research and gathering input from other drivers, I settled with the following. 35lb front, 38lb back. 20x10 (40 offset), 20x11 (37 offset). Compare to stock 19" 35lb, that really isn't too bad. I think OEM 214 20" are about 42 lb. I have to say, I am quite impressed with the quality. Granted, I just put this on today and have not driven many miles yet, but initial impression exceeded my expectation. Great detail with BMW cap and little ///m mark as well. As I put more miles, I will update this if anything pops up.