After two days of riding (my commute isn't intense, but I push myself, so I end up breathing very heavily), I can say that the mask made a huge difference in my "recovery" today. Last week, I rode Wed/Thurs, and I was a mess on Fri. This week, it's been windy on top of the high pollen count, and after riding Mon/Tues, I only have mild symptoms today, even without all of the meds I took last Friday. I'm sold on the mask.

My glasses fogged up at stoplights a bit, and I had to adjust the mask some during the ride, but it's a small price to pay for being functional and foregoing all of those meds.