The whole intention of getting the R* was so that my wife could comfortably ride along. I've only had it a few weeks and most riding has been to and from work with some errands thrown in. But I've taken her on a few rides.
So to date I'd estimate 85% solo. I'm hoping as she gets comfortable riding we venture out more and those numbers will move towards 50/50. But I'm always going to have my solo time.