I received my VTF-3MK2 a few days ago. Anyone considering this sub should not hesitate to give it a try. I'm going to list the subs I've had in my difficult(12x13, cement slab) room, along with my impressions. Velodyne 810 (8" driver, 10" passive radiator) circa 2000. This was my first- not bad, but definite limits on loudness and low frequencies. But it was punchy, not boomy- as it should be-I don't think it had much below 40Hz to offer. It was a start, but I always felt as if I were missing something. My neighbor is still using it; since he does not read A/V mags and forums, he's happy. Hsu VTF-2- circa 2000-2001 I replaced the Velo with this- great move. The VTF-2 went much lower than than the Velo, and retained the texture and punch too. This sub was great. No boominess, just great bass feel. Several people I know bought this sub after listening to demos at my house. SVS 20-39PC circa 2002-2003 As soon as this sub arrived, I sold my VTF-2. The 20-39PC definitely went lower, and louder, but was not nearly as 'clean'. It certainly played down to 20Hz and below, as checked with my trusty SPL meter. But something was missing. No more punch. I even ordered the 25Hz tuned port for it, hoping the higher tune would change my impressions. I moved it around the room, trying various placement, to no avail. Oh well, I lived with this sub for about 1.5 years and sold it. SVS 25-31PC+ circa 2003-2004 The new SVS seemed about the same as the old- since I have a small room, I was not able to fully realize the extra output available to me. I figured the new amp, driver, and different tuning points available would give me back the punch of the VTF-2. No. The SVS just did not have the texture and 'speed' of the Hsu VTF-2. PSB Subsonic 6i circa 2004-2005 Alright! I was able to buy this sub at cost, since I was now working for a PSB dealer. This sub gave me back the 'texture' that was missing in the low-end. It sounded really good, but I knew that it's ultimate loudness and ability to go low were not strong points. Points to the SVS in those regards. However, it made movie and concert watching extremely enjoyable- it was not a 'one note bass' sub. I started a thread at the time that became somewhat contentious, where I stated I preferred the sound of the PSB to that of the SVS. Hsu VTF-3 current Take the good things I've said about the above subs, put them all together, and it equals the VTF-3. It plays LOUD. It plays LOOWWW. It is 'fast'. It has texture. It sounds like my original VTF-2 on steroids. I can heartily recommend this sub. I've been bringing out all the old standbys- U-571, Ronin, T2, Desperado, World Is Not Enough, etc. All have a newfound vitality. I don't know what voodoo is in the VTF-3 box, but it truly rocks.