What I notice most about my bows, or look for most I should say. Is how the arrow acts from the time I release until it hits a target. I like strong flight from the start to finish, like a train cruising by. Some bows act as if they gain power or lose it during flight, while others seem to have it out of the gates and maintain it for 25 yards. Now whether or not that is speed or power, I don't know? But I like it, look for it, and build for it.