I used one Mi10 at rehearsal and found it sounded okay but added a second and everything that seemed to be missing from the sound, low bass and depth, suddenly appeared. I have used a Barefaced 2x12 in the same situation (smallish pub room no audience) and to me this cab sounded better by being cleaner and better defined.
2 x Mi10 in the music room (i.e. spare bedroom) sounded great but using one was not so bad either so I think room acoustics play a great part here.
I think Alex may have come across this effect hence he introduction of the One10 and Two10whi is the route I may go.