Wow, this is about as "SHUT UP AND TAKE MY MONEY!" as it gets, this is exactly what I was looking for. I've got the Dynomax axle-back on my MKS right now and it's just so . . . quiet. I know some people are fine with that but I'm 32 with no wife or girlfriend to worry about at the moment and while I don't want something obnoxious, I do want something more noticeable than the Dynomax is. From the video and your description, the exhaust seems comparable to what I had on my Lincoln LS, it was a Magnaflow setup that had just enough growl at start-up and at cruise speeds to let the world know you weren't stock, and if you hammered on it, then it sounded really nice. It was the same as what you describe in terms of "droning" too, it was there because it was louder but it wasn't annoying.
Between this exhaust and the downpipe they offer, I'm gonna have to be doing some business with Stainless Works in the near future.