OP.
As I sit here listening to my recently acquired Spatial M3TM's. I will tell you that they are different. I can see where they might be a completely wrong choice for some. In my space, with my rig they are magic! I will comment on two major impressions, in my space.
First thing I noticed was what I perceived as a lack of bass. What Ive come to realize is I am hearing a whole different kind of bass. Or maybe I should say now I am actually hearing all of the bass and not the box. The speed and definition in the bass is really satisfying to me.
Second thing I noticed was the absence of the room. They really do blend into a room much better than box speakers do. The boomy bass is gone that classic hole in the 80hz zone doesn't exist anymore...
Running them with Innuos zen mini and power supply, Pontus II, Aric Audio pre amp and Aric Audio super KT88/150 amp, all helix design diy cabling. Have had monitor audio silver 500's, Cornwall IV's and Focal 948's.
Ill stay with Spatial at this point!
Not sure if there was any value there but would strongly encourage you to try and experience OB's if you have interest. I find them simply amazing for the investment.
J.F.