I ride with a Solo. It's a pretty solid light, very dependable. I have had no problems in the rain.
The light pattern is decent enough, I can see OK in a heavily forested area. It's not like daytime, but good enough since I know the trail.
The thing that annoys me is I have more than one bike, and it is a bit of a pain to move that frame-mounted battery and snake the light cable every time I switch bikes. I'm looking for something more portable for this "dark season."