I've been using this product for a couple years now, and this was just a refill (my third one, I think?)
I use the Brow Wiz in conjunction with the Dip Brow. I'll use the Dip Brow to line the bottom of my eyebrow, and to fill in any sparse areas. Then, I'll use the Brow Wiz to feather in the rest of my brow.
The Brow Wiz is extremely natural looking. I use it by itself when I'm on my "no makeup" makeup days. It stays put, all day. It's waterproof in that it won't wash off if you're walking in rain, but it does come off a bit if you're doing something like swimming.
The blonde color that I use fits my blonde hair perfectly. It's not too ashy as some other 'blonde' products can tend to be.
My only complaint is that sometimes the product can kind of gunk up in your brow. To fix this, use it with a really light hand, and comb through your eyebrow after you use it with a brow brush.