Well I guess I have to say it works. I had conducted a few experiments with the scope laying on the hand rail of the deck while was raining, but you know in the woods it is different.
I took the Bushnell Trophy off my Remington ML and put a 3x9x40 - 3200 with RainGuard on just before hunting season started. Well, today was a true test. It had snowwd last night at the elevation I was going to hunt, a really wet snow. It was snowing lightly this morning when I got there and through out the day it was either snowing, raining, or hailing all day. I guess I should also mention the sun did shine enough to cause the snow to drop from the branches also. But, I did hunt all day without ever putting scope covers on the scope. Every time I would check the scope it was fine. Nothing seemed to cause a problem, it was plenty shootable everytime I shouldered it, all but once. One time I had set down on a stump and put the rifle across my lap and placed both of my hands near the lenses to rest and relax. My warm hands did cause a little exterior fogging on the scope. After I moved my hands it took only a few minutes and the lenses were clear again. My final test was the last 200 feet out to the road through some real thick new growth trees. I placed the sling and rifle over my shoulder and slugged my way out. When I got to the road the ojective lens was completely full of snow, I used my finger to wipe the snow out and around in the housing, put the rifle to my shoulder and all was fine.
Now, had I stumbled on to an Elk during this excursion everything would have really been fine, oh well I have a couple more weekends.