Oh so glad I found this thread again. I had an older version running on my 3GS with iOS4 and totally forgot about it. Now BT Mono is running in the 4S with 5.1.1. Can nicely select to have sound coming out of the speakers, the earpiece, or the old Voyager Pro (v1) that does not even support A2DP. Sound is not great, but OK for audiobooks on the train, live sports commentary or when ever you forgot the real hifi earbuds but still want the sound without having everything on speaker. Great stuff!