Yeah, I've got a 2011 STi Limited and the BT is pretty much unusable and I've got an iPhone 4. My father refuses to even talk to me when I'm driving because he can't hear me. I can turn the gain down, but then I have to yell for anyone to hear me. Lame.
As an experiment I borrowed my wife's Jabra Cruiser ($25 + $5 shipping) and called my father. He thought I was calling from my house, when in reality I was doing 65 MPH on the highway.
It's absolutely ridiculous that I spent all of that money on a car and the BT is outclassed by a $25 device that clips to the visor. To be honest, it's a giant steaming pile of male bovine defecation.
SoA, for the love of everything boxer and turbocharged, please, please, please issue a TSB.