Well, I'll say that when weather.com is reporting 15-20 mph winds I am not enjoying my ride as much. Part of it is the sound effect - I gauge effort in part by sound and when the wind is up I have to gauge it by feel while my brain is disoriented. Studies show that you feel more tired when you have had wind noise in your ears for a while. I actually check the predicted hour-by-hour wind speed each day before I ride to consider my route. I don't like going long on a windy day because the effort I'd like to save for extra distance I have to put in to dealing with the wind.