I have owned a Sunfire Jr. (a few years old now and not with "True" in the name I believe) and I am very pleased with it. I should note that I use it in my music only system. At the time, I had a moderate sized Klipsch subwoofer in another room as part of my HT setup and my wife made it clear that no such box would be allowed in our formal living room.
Numerous reviews I have read discuss it being finicky to set up and I concur. When I first got mine, I recall being less than blown away by it after first setting it up. With some tinkering, mostly with regards to exact location, it comes close to blowing me away, particularly as you truly do need to look carefully to find it. I believe though, that its strength is in tight, fast bass, dare I say "musical". While it puts out a significant quantity of bass, a bassophile would likely want two to get the kick in the stomach effect. Two would clearly do that, imho, but so would alot of different options available for the cost of 2.
Hope this helps. Let me know if you have any specific questions and I'll do what I can to answer them.
