Since my room is very dead (though I am making it a bit more "live" now) the off-axis response did not matter much to me. What did matter was clean transient response, a stable image, and something that would not sound "small" coming from big panels (Magnepans). One thing I tend to notice is how sounds (vocals and instruments) transition among drivers up and down the frequency range. ESLs and to a certain extent Maggies do this very well using full-range (mostly) or very broad overlap among drivers. Too many conventional speakers seem to change sound character as frequency changes. Imaging and "soundstage" changes as well as the timbre in some cases. Back when I used to be able to test speakers I would do frequency sweeps and sometimes the difference was startling (perhaps more to the dealers than to me after many years playing at this). The Salon2's did not seem to do that, or at least much less than other speakers at and well above their price range.
There are so many good speakers these days that you (or maybe just me) often have to look and listen closely to distinguish among them. That is one of my benchmarks.
Note I have not heard speakers in the class most here have auditioned; my listening topped out with Focal, B&W, and a couple I've forgotten in the $30k to $50k a pair range.
FWIWFM - Don