Well, my listening room is 22' x 15', the width on the other end is 10' because of the hallway. My set up is at the 10' end, but I'll move it to the 15' end soon to get a wider soundstage, hopefully.
Other than my AVA Ultra 550, Super Pas4ii (improved), and Ultra DAC setup, I have a truckload of lps, and 9 turntables.
My Ultra 550 experience is it's haunting soundstage. The extra bass extension, and more detail were pretty much given, since that was what I expected from Frank's upgrade.
"The Song Remains the Same" had never sounded like a "live" recording since the music was heavily modulated, but played through the Ultra 550, it sounded like sitting at the front row seat, I can actually hear Jimmy Page walking across the stage while he's playing

. The harmonic from John Paul Jones keyboard in the song No Quarter can only be heard through the Ultra 550, I didn't even know it was there until now, well, of course, it was played through a high quality turntable which I've acquired just recently, I haven't heard the CD version yet (I do have the CD), but I will.
Listening to my Eric Clapton's "live" recording "Eric was here" is another story, great recording.