i just did the AL to the CL swap in my black interior E90. I'm not quite sure if I like it. The AL gives you that high contrast.
If you swap just the dash part, it's the major piece that you'll see on a daily basis. In fact, I rarely notice the AL trim on the door when I had it.
Overall, the CL piece doesn't look great in my eyes b/c it's not rear CF, it's just a plastic weave that looks like CF. The major positive I got out of the swap is apparantly the source of a rattle in my dash was my AL trim. Apparantly the AL is glued onto a plastic frame which bolts on to the console base. It was the AL and the plastic frame that was rattling. The CL is a direct bolt on to the console, so less pieces to rattle.