I am a BMW Tech and have driven every tire currently out. Hands down best summer tire and longest lasting. Michelin tires are the best for BMW's low road noise, good sidewalls, fantastic wet traction. I will only buy Michelin for my own cars. Yes they are expensive but think about it... it is the ONLY thing that holds your car to the road. I always say tires and brakes are not the place to save money.
When the outside air pressure is equal to inside tire air pressure you should have bought tires a long time ago!