The owner's group is somewhere on Yahoo. Don't have the address.
My experience with a pair was not too positive. Kind of had a Bose-like perspective with the sound everywhere. They're too tall for ordinary chairs so you have to tilt them downwards to get the focus that you CAN get. But, and this is a big ol' butt, there appear to be lots of happy 645 owners, and, after all, there is still (I guess) a 30 day free trial.
My experience with a pair was not too positive. Kind of had a Bose-like perspective with the sound everywhere. They're too tall for ordinary chairs so you have to tilt them downwards to get the focus that you CAN get. But, and this is a big ol' butt, there appear to be lots of happy 645 owners, and, after all, there is still (I guess) a 30 day free trial.