I use Eco Pro all the time. I actually wish that I could have it kept in that mode when I start the car. I know I know, sacrilege! BUT, it does have it's advantages, like allowing me to save enough money in gas in everyday driving to justify putting it in Sport + and tearing it up without feeling guilty!
*NO LONGER ON ORDER* '12 328i Mineral Grey Metallic w/black leather/aluminum&black gloss trim/ZSL/ZPP/Xenons