I just finished installing the new HD speakers into my Schuberth and the difference is night and day, at least in terms of volume, way louder than the old bits and slimmer too.
Despite it all working after the firmware update on the Sena a couple of weeks ago, it all had a funny five minutes getting connected correctly after the new phones went in. Weird.
Probably needs a good service. I'll pop it along to the local church on Saturday and see if it is any better when I get it back on Monday.