I thought I'd add to this - weather finally cooperated and we did a ride with these this weekend (Cardo BK-1 duo). I'm really impressed with these, but more importantly, my wife is really impressed. It's possible to have a normal conversation while you're riding along. Really was helpful for making sure that we stayed together, pointing out road hazard, talking about stuff we saw on the ride etc... Both of us ride along a decent clip, so it's not particularly conducive to having a conversation without them. With these, you don't even have to talk in a loud voice, just a nice conversational tone.

You an also pair these up to your phone. If you get separated, you can call the other person. All they have to do is talk to answer the phone or just stay quiet to reject it. Works great!

I wish we'd had these years ago. Great product, and highly recommended. Really adds a lot to the ride and it makes it much more of a shared experience than it would be without them. Importantly, it does a lot for safety with traffic, route changes, hazards on the road etc...

J.