I don't have a "HT room", so to speak. Just a small 15x15 room with an opening to a kitchen at one end, a hallway on the far right side at the other. I have had 4 different HT setups (all relatively small), as well as experience with my cousin's setup, a friends setup, and my parents. Plus my 6 years of an employee at a home theater/car audio shop.
In fact, I made my Def Tech purchase without ever listening to them. While the company was an authorized dealer, my store was too close to another dealer and wasn't allowed to have the speakers in stock. I had to buy them before they could be sent to me (and only employees could buy them). I purchased them for one reason and one reason only, the sub in the center channel. I had become a firm believer that the center channel needed quiet a bit more bass to match up better with, typically larger, mains. I must say the speakers have never disappointed me (until the built in amps in the towers quit on me and I had to replace them, but I know that just happens sometimes). But for some reason, I just don't find myself as thrilled with the way the bipolar towers sound as I used too. Its hard to explain.
I find myself wanting to go back to my original favorite speaker brand, which as my name implies, is Klipsch. When the purchase was made on the Def Techs I listened to as much music at home as I did watch movies, and I prefer the sound of the Def Techs for music over the Klipsch speakers. But in the last 3 years or so its become 95% movies, 5% music. And I do like the sound of the horns better for movies. My only problem is, I don't really care for (and I can't figure out why totally) the Klipsch center channels and the way they match up with the towers. To me, they aren't as tonally balanced as other brands are. I can tell a slight difference when sound pans from left to right. The only way for me to avoid this is to get the exact same speaker and put them all across the front. Its going to be difficult to do 3 towers across the front without mounting my plasma over the center one on the wall (which isn't possible where I currently live), or do 3 centers across the front. But then, I am not impressed with the low end output of any of the Klipsch centers, save for the RC64, which I cannot afford yet. Ideally the THX Ultra 2 system would be the best for me, but I wont be able to afford that thing for years.
I may just stick with Def Tech for a while and might try out the 3 C/L/R-2300's across the front. That would be my cheapest option overall ( I have access to dealer discount still for Def Tech too ). Maybe wait and see if Klipsch releases as speakers at some point that I like that 3 identical speakers can be used across the front.