I bought a pair of barely used H75's for really cheap (I think it was US$160 for two speakers)
they sound edgier and punchier than the mesa v30's I replaced in a marshall 1960 cab, but the v30's are definitely much louder and more present (still very nasal)
compared to reissue G12H30's, they actually sound very close, but middier and they also have a rounder top end
I wouldn't pay the price of a new piece, but they are better than actual celestions...
maybe for the M75... damn... that thing sounds good :(