I got the 3BR TAPP Lite before my trip down to Deals Gap this past week and used it to charge my iPhone in my tank bag. Used it in the rain (and snow for that matter believe it or not!) and it worked. Of course, I have it attached to my bars and frankly as long as you're moving very little water hits it anyway. I'm not sure it's much better than other solutions but as I said, it did work. My only real complaint is that the cap broke off the very first day of use. The little plastic loop that connects it to the body is poorly designed, it's the same hard plastic as the housing it seems and it's thin and brittle. I nearly lost the cap in the fairing but managed to dig it out. The rest of the trip I had to keep track of that little cap in my tank bag any time I unplugged the USB cable.
2018 V-Strom 1000XT
2011 V-Strom 650A (Sold)
"Remember, you don't really own anything you can't carry at a dead run."