Wow, Robert: think you have your dive computers mixed up. I have dived with a Sol (Luna minus heart monitor) for six years. Screen and info is larger than Cobra, and very easy to read, even for folks like me who have reading prescriptions.
I am an underwater photographer, and the Luna/Sol is by far the best dive computer I have ever owned. I realize the original post was 2009, but thought another point of view was warranted.