No, i cannot say i have tried the magneto speed. However, your comment about sunlight caught my attention. Them standard chronograph don't require sunshine. Actually, sunshine causes issues with accuracy. Chronographs with sky screens work best on cloudy days, or if a sunny day, they work best in the shade. The glint of sun light off bullets causes them standard chronograph to be inaccurate.
The magneto speed has many advantages. A key advantage is they will work accurately in bright sunshine, whereas the standard chrony or whatever, won't. Another advantage with the new style adjustable magneto speed clamp, sabots won't make a false reading, nor do they smuck the instrument. If i were without a clock, and looking, i would probably look real real close, at the magneto speed; i like the idea.