So far so good with the sub. Unfortunately, I can't isolate the sub as the only improvement in sound as I also added an NAD T763. The NAD pushes 100watt/channel while my former pushed 80(Denon) watts/channel. The combination of the two turned my room into a whole new beast.
The sub does not shake the foundation.. but that's not really what I was looking for. I wanted to feel Matt Apts kick drum in my chest and the UFW-10 does that very well. For HT, its presence is certainly felt, but its much more of a defined rumble rather than window pane rattle. In a smaller room, I know it would do a better job, but for now, I have no complaints.
I've only had it for a few days so as it breaks in, I'm sure I'll have more to say...
edit...
I forgot to mention that I am dealing with a hum coming from the speakers. I'm planning on taking it down, piece by piece to try to isolate the hum, but I'm guessing that it has something to do with the fact that 1) all of the cables are in such a mess or 2) something being improperly wired. I made all the connections in a hurry on Christmas Eve and haven't had a whole lot of time to play with it since.