Well I can testify to them that I rode in No. 23 on my first visit to the WHR (in 2006) and it was the highlight of the day for me. If you want a "heritage" Welsh Highland experience it's a pretty good way to do it - after all, you can't see that you have a Garratt in front of you or modern stock behind you unless you lean out of the window! I also rode the whole FfR in both directions in vintage coaches in 2011. Much more atmospheric than the modern stock, and you don't have to worry about keeping your bag(s) clear of the gangway. The "at-window" refreshment service we enjoyed at Tan-y-bwlch on that occasion is also a very good idea.