I started off with the wide body Briton II. I bought these without hearing them after they got great press at RMAF 2013. I then moved to a much smaller dedicated music room and these beasts were too powerful for it. I had never heard such thunderous quality bass before, let alone out of a stand mount. This model is no longer available. I believe it had something to do with not being able to source the wood anymore to make the large one piece horns. Next was the Briton Studio Monitor, which is a 3-way version with a smaller horn. While still a large stand mount these integrated into my smaller room better. David then came out with a nearfield specific Briton Hybrid which is a smaller speaker, 10" driver, and his "Acoustic Lens" instead of the horn. I went all in with these as far as upgrades go, AlNiCo drivers (same woofer as your Mk-II), silver wiring, silver binding posts, and some large custom RIKE caps. These are outstanding for nearfield listening! I would say all three had their house sound, which for me is very dimensional, big sound stage, and really good bass. I've always driven them with low power tube amps from Shindo and Allnic.
From my experience you will benefit a lot by letting them run in, even more than 40hrs. I would say they keep getting better up to about 100hrs. Which wood combination and stands did you get? Would love to see some pictures!