It's not exactly apples to apples, but happy to share my experiences with Harbeth Compact-7es3s.
The great room in my 3rd-floor condo is an imperfect rectangle 22X14X9, with a 4-wideX6-deep "cutout" in the far left corner (carpet over concrete floor, with a wood/plaster ceiling). Something that eventually factored in was that local building codes required concrete & steel for the first 2 floors, but allowed wood & plaster from floors 3 and up.
I put the speakers 8 feet apart, 6 inches from far wall, and on 19" sound anchor stands. The compact-7s became temperamental at "higher elevations." Using taller stands substantially increased the level of bass-bounce/reverb in the room. In addition, I initially tried 22 degree toe-in, but found for the room that 0 toe-in gave the best sound.
Overall, the speakers were very easy to drive and not fussy about cable. Worked great with Linn separates, and later an Ayre integrated. In the end, I swapped them out for the smaller P3-ESRs. Unfortunately, the Compact-7s were borderline too big for the room, given that I'm in a condo with both floor and ceiling neighbors. I never received any complaints, but found it judicious to go with the smaller speakers, which I have on 22" Linn stands. Not quite as resolving as the Compact-7's, but the upstairs neighbor did mention at an HOA meeting that she appreciated that her floor "wasn't vibrating anymore on the weekends."
