I bought the cygo150 for daylight visibility. I tested the cygo alongside my niterider and the niterider is better for side visibility during the day.

I returned the cygo. The cygo was definitely better for straightline visibility. However, my niterider was nearly as good, maybe 70% as good despite 1/5 the lumens rating.

The reason for the niterider's advantage is simple: the red lens wraps around to the sides to a greater degree. Only a small portion of the cygo lite red lens face sidewards.