I received my parcel almost a week before it was scheduled to arrive.  Nice surprise.  I sprayed my new UGG boots with the spray (I've been waiting for this product before wearing them). I was slightly worried right after I sprayed them as they looked a lot darker and a bit "mottled", but after only an hour or so, the spray has dried and my "Chestnut" Ugg Boots look just beautiful.
I'll add more when I see how well it protects my boots, but thus far the only problem I had with the product was the pump bottle is a little hard to manage.  There was an odor to the product when I first sprayed the boots, but now, an hour or so later the smell is gone and my boots just smell clean and fresh!

I've changed my rating from 4 to 5 stars.  I haven't yet worn my new boots in the water, but I did clean and spray my old ones that had been leaking badly.  After they dried, I brushed up the nap and then the rains came!!  I've worn them for the past three days walking through standing water and no leaking at all!!  I had decided to just toss the boots because they weren't keeping my feet dry, glad I didn't and tried this product.  It really works!!!