Well - the batteries finally ran dry today, after about 400 miles total riding. I started listening to MP3 recordings when I began riding today - figured that would put a load on the system, by keeping it working 100% of the time.
I think the helmet was trying to give me warnings that the battery was running out by interrupting the sound transmission briefly (for about 1 second). At first these 1 second interruptions were widely spaced apart (a minute or two), then they became closer together, then the sound system stopped working.
The quality of the sound when listening to MP3 recordings is, uh, not as good as I expected it to be (that is putting it in the most polite way I can). I'm not sure why this is so - the speakers are just installed loose in the ear pockets, as the instructions stated they should be. I think I might try getting some 1 mm thick foam padding, and enveloping the speakers in that, so they don't 'rattle' against the foam inner liner of the helmet. Perhaps that might improve things. The quality of the sound is quite satisfactory for intercom conversations, phone calls, stuff like that, but like I said, is not up to what I expected for music. Keep in mind, though, that this is a first impression only, the system is new to me.
I have heard that BMW issued some kind of technical bulletin (a recall) for early production versions of the WCS-1, this due to excessive hiss in the speakers. My local BMW dealer has been less than forthcoming with me about the story behind this technical bulletin. If anyone reading this has a good relationship with the service or accessories staff at your BMW dealer, could you perhaps ask them if they have received any memos from BMW about the problem of 'hiss' in the speakers of the WCS-1, and if so, what does the memo say about it?
Thanks,
Michael