It cleaned up well. The Continentals are great bikes, as are the New Worlds. These bikes are among the few light roadster-style bikes that can go head-to-head with a Raleigh or Hercules or Phillips. The graphics on these (and the 1950s-era bikes with winged graphics) are great.
The English were generally more serious about their adult sporting and utility bikes than the Americans were, but Schwinn soldiered on producing some really good 3-speed bikes into the early 1960s.
The collectors seem to favor the pre-war Schwinn Superiors and Paramounts, but my personal opinion is that Schwinn's golden age for lightweight 3-speeds started right after the war, and into the 1950s (I also think this is true of Raleigh). They offered some neat choices - New Worlds; Superiors; Continentals; and the Paramounts. You'd expect that kind of choice from someone like Raleigh or Hercules, but not so much an American company (the automobile ruled America in that time).