I know this will be a bit biased from me because I went with the X5M when searching for a new BMW three months ago but I don't think it's been compared enough. Thoughts? (I wish I was a member on bimmerpost before I bought the X5M, might've changed my mind but I'm loving the X5M!) The biggest plus to the X5M is its all around performance because the weather in St. Louis, MO where I live is crazy, we had snow today. In an M3 I can't go from 0-60 in 4.5 in this weather whereas in the X5M I just did and it's raining.