Look, I had the Jabra BT 125 for a fucking while, and overall voice chat has been good. Some issues sometimes with certain people. And it's always the same. I have some echo with Live for instance, while I hear Cagen perfectly well. And AFAIK it's the same the other way around. Cagen hears me well, but ChryZ doesn't.
So, since the off HS got so much praise, I bought one.
Verdict: much more echo, the damn thing is less comfortable (excepy the earplug) and heavier (it's huge ffs) and the battery life is shorter than the Jabra.
Overall, the voice chat quality is inferior, without a doubt.
Since I still had some doubts, I even switched HS during a match, to avoid any lag or whatever related issues. Jabra was once again better.
Now, maybe it's better for other people, but have they thoroughly compared the off HS with another one? Maybe, maybe not.
And maybe it may depend on indepedant factors, I dunno. So before buying a new one, I'd say try it out if you can, before I'm not sure the Sony HS is automatically superior.