For what it's worth, I'll mention again (I posted a similar comment on another thread a few months ago) what an otologist/neurotologist said at the April 2009 ANA/NJ workshop on BAHAs: within a very short timeframe of becoming SSD (he thinks it might be as short as several weeks) the brain permanently loses its ability to localize sound. And, yes, he said "permanently;" he didn't say anything about age being a factor.
He said that he always tells his patients this so that they won't be disappointed if sound localization is the only, or a very important, motivator in their consideration of a BAHA. I'll add that I didn't know this docctor (I had my AN surgery and BAHA implant at House Ear), but he had a good bit of BAHA experience.
I had been wearing my BAHA Intenso for almost a year at that point, and I had been thinking that I had been experiencing some accurate localizing. I think I had accurately located a couple of ambulances (on separate occasions) when I was driving. Realistically, I suppose it could have been attributed to "luck" or sub-conscious visual cues, or whatever. Given that there is a finite number of directions that a sound could be coming from I guess it only makes sense that I'd pick the correct one on at least an occasional basis. That being said, the BAHA certainly helps with the ability to hear a given sound, so I think that's pretty valuable in and of itself, whether or not you can instantly determine the directional source of the sound.
There may be many who disagree with this doctor's theory and feel that they have regained at least a good measure of localization with their BAHA, TransEar, CROS, etc., so maybe this is yet another "AN thing" that is very individualized. I do think that those of us with SSD may be (consciously or unconsciously) honing our other senses -- and maybe a heightened measure of plain old "common sense" as well -- to help us with directional issues.
I think the BAHA is an excellent device and I'm awfully glad I have mine!!
Catherine (JerseyGirl 2)