I ended up buying the Jabra Drive. Sweet Baboo is happy with it. I notice on the receiving end of calls that it's a bit staticky for the first 5 seconds or so; then the sound clears up.

I just went to Amazon to check which Jabra model I'd bought before posting this, and I saw the "Buy It Again" option and wondered if I should buy one for my own car --- because my Samsung Galaxy 3 w/speakerphone on isn't loud enough to hear someone while driving.

But --! The Jabra Drive that I bought on 12/22 for $29.99 plus tax, total $33.98, Amazon Prime free shipping, is now listed at $64.99 before tax (and still Amazon Prime eligible). Should have bought two before Christmas, I guess. Instead, I'll wait until I see that Jabra or a similar model for a more reasonable price.