I had an SVS SB-2000 and the JL E110 in the same room, for almost a month. I bought a refurb SB-2000 just to test it.
Played Skyfall, Fifth Planet, DSOTM SACD, Star Trek (the volcano scenes).
On the SB-2000 alone,
1. Skyfall was completely muddy in the helicopter scenes and the explosion scenes.
2. The volcano scene was a non-starter.
3. Fifth element, the titles and craft landing was a bit easier to handle.
I used both SB-2000 and E110 together in a daisy chain (E110 allows this in setup), and I could tell the difference between the two. The plate-amp was bad the first time, but SVS customer service did a very fine job and sent a replacement quickly.
Removed the SB-2000 (it was eventually returned), added a second E110, and Skyfall and Fifth Element was an eye-opener. My kids almost threw me out of the house. I was relegated and confined to the basement for the night.
BarryG and Fill35U have heard the 2ch with a single E110. Flight of the Cosmic Hippo from Carver Reference CD#1 shakes the basement like no other. I have no plans to use the HT setup to play the CD and be divorced and disowned at the same time.
I have heard the Fathom and Gotham at the JLA dealer on stereo setup (the dealer does not have much of a HT room). They are even better, but the price is not very amenable. I prefer two physically separate E110s to a dual-sub setup.
I also played Top Gun as a test on 2 x E110 setup using HD-DVD, and it is most excellent.
I would highly recommend the JLA subs.