with the HFT mic fix (DIY or dealer), it all works very well for me
Sometime need to raise my voice a bit, but generally not to shouting levels.
Voice recognition when making a call is pretty good, it (so far) has only mis-heard my numbers a couple of times (in 4 months), although the first time I use it each day it insists my 'redial' is me saying 'star seven one'.
hardly the biggest problem in the world - it always gets it righ on a second attempt (and then on until the next day).
As mentioned, you can have several (4 or 5?) phones paired with the car, which is great if you both drive it.
And it's easy to swap between which one is active - saying 'next' causes the car to search for the next available paired phone if you're both in the car with your phones turned on.
Nokia 6230i definately works, as does a Samsung D900
Some phones (D900) take a bit more effort to set up initially (you have to connect the first time, then set the connection to auto authorise), but it's a one off extra 30 seconds of fiddling with the phone so just something to be aware of rather than a problem