I've used the radar (first gen) since it first came out, and it really has helped to take the surprise element out of riding with occasional cars. If I use it in heavy traffic, it is just annoying. I do have to augment it with a second, brighter, tail-light (Cyglo)

Thanks for your post, as this is useful information about cross-compatibility I was not aware of.

I hope your wife is able to enjoy cycling as much as possible. It is remarkable she is eager to continue. Great that you are so supportive.