So how many people are using subwoofers

I like the REL a lot, but you should also look at the Hsu brand - I use a couple for cinema use only and they meld well and are quite tunable, depending on which model you get.  I do use them for music play back with organ - my main speakers are 3db down at 20 Hz while the Hsu go down to 16 Hz (what you need to reproduce a 32' organ stop, which you feel rather than hear)

I agree Wolf.  I wonder how many have not purchased them because they are not priced high enough.  I paid about that for my one SW-12, used.
dc, you say,

"I can vouch for REG's observations.  It KILLS my single V2W"

What is your context?  Did you hear REG's set-up, or have you tried them in your own system? I haven't heard much from owners but I am curious.  

I am a big fan of having sub woofers.  Having said that, I find that it takes a lot of patience to get them "dialed in" to the room and the side speakers.

A few months ago I upgraded from a pair of two-way monitors to a pair of three-way floor standing speakers whose specs indicate bass as low as 37hz.  It took a while, but when I got the floor standers in just the right spot, they sound great, but don't really produce that last octave of bass.

I ordered a pair of JL Audio F113V2 sub woofers, really great subs, but they brought out all sorts of problems with the room.  I have installed six bass traps, and have two more on order, and am on my way getting the boominess out of the room, but it's been a struggle.

My former system was in a much smaller living room, took some time to get the sub dialed in, but once I did, it put a wide grin on my face!

For me, I really enjoy having that last octave of the musical spectrum, so it's been worth the investment of time, patience and money.

Running dual rel s2 subs with my gato fm6

I agree wholeheartedly when Bob Reynolds says:
" Utilizing a sub, any sub, is all about the setup".

I'm now on my fourth or fifth setup with subs and in all cases it's taken a while to get them properly "integrated" in the system.

A few months ago I added a pair of JL Audio subs to a new setup, which was really "dialed in" to the room before the subs arrived.  Long-story-short, the room had a lot of "ringing" at low frequencies, but 10 bass traps later, using the Room EQ Wizard software and a calibration microphone, got the "ringing" under control and the subs really well "integrated".

One of my buddies says that "the best sub doesn't sound like it's working"...until you unplug it and find that last octave or so of low bass really works best with a sub.

One last thing, if you can swing a pair of subs, there is something more "visceral" having them, hearing and feeling the bass coming from one side of the sound stage or another (or both).

Good luck!  I hope you have success integrating sub(s) into your system, if you do, you'll have a wide smile on your face!