"Maistre" is traditionally pronounced (i.e. sounding the "s" and rhyming with bourgmestre); that is how it is usually heard at university and in historical movies (as in Sacha Guitry's 1948 film Πρότυπο:Interlanguage link multi). The pronunciation (rhymes with maître) is sometimes heard under the influence of the modernized pronunciation, adopted by some descendants (such as Patrice de Maistre).
