I have a pair of the 102390 dark brown Oxford captoes. Elegant last, although I wish I didn't go 1/2 size up as I have narrow heels. Noticeable difference in quality from classic collection.
Much more of an attractive shoe in the flesh than from the images on the website.
I'm still new to decent dress shoes (Loake 1880 Aldwych last and a couple of pairs of shoes from the classic collection), so am not experienced enough to evaluate the difference in construction and leather. However, Linea Maestro feels better and is most evident in finishing.
Unlike others (and my Loakes), I did not experience any discomfort with the uppers. This remains true for both classic and Linea Maestro.
I'll probably try Carmina next year because of the greater range and colours (especially single monks in burgundy / oxblood). For the basics i.e. black / brown Oxford toecaps and monks, Meermin hits the sweet spot.
P.s. Currently having my single monks re-soled with a Dainite sole due to a mixture of puncturing right sole (must have stepped on tree root or two in the wet - goddamn London pavements), little bit of water damage and London weather. At least one pair of shoes with Dainite soles is a must in London.