I was reading this thread last night and thought, "Hey I should watch 'Fellowship' again and pay more attention to the LFE now that I have my 350v3". With the sub set at 10 o'clock and 0dB on the Rx there were quite a few scenes that sent vibrations up the back of my chair. I was only able to watch the first disc as it was getting towards 10:00 and didn't want the rumbling to knock the neighbors out of bed!
Although it was almost twice as much as my Paradigm PDR10 I'd say it is at least twice as good. In my opinion, you can get by on smaller subs for music (or none at all with tower speakers) but if you have any intention of going HT you might as well go with the bigger guns now (unless you are also intending on setups in multiple rooms and can demote the sub to the secondary system as I did).
A thing to note for the average Canuck is that we don't have as ready access to the lower prices and shipping on new SVS and Hsu. The lowest SVS (PB10) is $499+shipping (from $20-60) from Sonicboom. The lowest Hsu (STF-1) is $400+? from hi-fidelity.com, the Canadian distributor. The 350 is $750 shipped ($675 from the FO) and is statistically closer (I haven't heard them) to the VTF-3 ($999+?) or PB12 ($699+ $25-68).