I’ll pile on for GR Research. I’ve had the NX Oticas and the dual 12” servo subs for about a year and couldn’t be happier. Incredible soundstage width, depth and height.
Another advantage of OB is efficiency, which allows you to use low wattage tube amps.
But I do have mine about 5’ from the front wall.
I used to have a full Gryphon system-still have all the cables-and I’d have to say it was mainly better in certain ways, not better overall.