I've heard plenty of W7 setups, one thing I like about the sub is that it still gets loud with low power, great sounding woofer also. I bought my TDX over 2 years ago now, I got it for a good price locally because it was the first TDX they would have sold (they wanted me to be the first one to have it, and since I was in college, they knew I would show it off to my buddies //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif ). I was very impressed with the woofer. To this day I never thought about changing it out for something else. Ran the woofer off of a Diamond D5 600.1, a D5 1200.1, a D7401 and now a JL 1000/1. Handled the power from all the amps, always ran it in a sealed 1.5 cubic foot box (before displacement), and I have never been disappointed. If for some reason there was a problem with Diamond (lets say they went out of business), then my next woofer would be a W7, but as of right now, I have no desire to switch to anything "better", what I have is great.