They are after my money!
Seriously though, I have pre-ordered a rake of SECR ones to run with my (old-tooling) Hornby SECR Terrier. A few years ago, I made up some Smallbrook Studios resin kits of Stroudley 4-wheeled coaches to run with my LBSCR Terriers, but my painting and coach finishing skills leave a lot to be desired. I can't do lining, for instance. Also, the kits were intended for the coaches in 1920s condition; although I whipped off the battery boxes and the truss-rodding, I didn't do anything about the duckets. The kits were for 1920s Isle of Wight formations, not pre-First World War, and didn't include a full brake. I will be considering whether or not to get a LBSCR liveried full brake, or whether or not to get a complete small rake of LBSCR liveried coaches.
Edit: Had another look at Hatton's website, and noticed that the LBSCR livery that they will be doing is the umber one. This will be great for any time from 1911. Previously, the LBSCR had had mahogany coaches from 1870 up to 1903, and from 1903 to 1911 an umber and white coach livery. Bear in mind that complete coach repaints would happen every 8 to 10 years, and that you unless you have evidence, you can only guarantee that new coaches would be in the current livery. I have a suspicion that Stroudley 4-wheelers would never have been umber and white, but presume that they would have become umber at some point.
My LBSCR Terriers are in the old Hornby version of "Improved Engine Green", so my current mahogany liveried coaches would be a better match. (The LBSCR started doing their locos in umber from 1905.)