I have one of their Coyote bags and I love it. Its a really well made piece of kit, tough as hell and waterproof.
It comes with a large stainless worm clamp, and bracket to attach to your muffler to keep the bag away from the heat. It also comes with a small container with brush of seam sealer, which sets like rubber and stops water seeping in.
I got mine for a good price but wish I had have gotten the great loop now, as itsa fair bit larger. You'd be suprised how much you can fit in them though. They also come with inner bags, that allow your to stuff all your crap in.
They are rock solid on the bike and Im yet to have them move an inch or need re-adjustment while on the road.
The downside is no security for your stuff, unlike lockable hard cases. You cant use them as a seat around the fire, and they can take a while to pack, if there not full, there is a fair bit of slack in the bags.
I dont get paid by the company but I love the product, and think there a cheap option to panniers. Well worth it in my book, but then again Im a klr rider...