New LS50 owner - black on black - maybe 16 hrs on them. I am extremely pleased! Yes they image and throw a big soundfield, as expected, but in my 13x14ft room they make really lovely bass - very tuneful and on-pitch, and very linear up and down scale, and almost more than enough. How these truly tiny boxes and drivers do it is some kind of KEF circumvention of the laws of physics as we know it. I have 24" Dayton Audio stands placed at sidewall and rear wall fifths (32" from front, 31" from sides).
Also surprised how easy they are to drive. I'm using an Elliott P3A, 60w into 8 Ohms, 100w into 4 Ohms. Reading the thousands of various forum comments, one would think using LS50s is a room and amplification crapshoot, one that can go very, very well or go abysmally horrible.
Now of course being an audiophile I'm already thinking about the next steps, and right now that's stands. Maybe try Herbie's Fat Dots and fill the larger support on the Dayton stands, see how that goes before looking at better stands.
Cam