It's underrated, undervalued (still worth less than retail as one of the very few steel Rolex), yet generally considered a classic and most likely to be discontinued in the next few years and never made in huge quantities. One of the likeliest currently available Rolex watches to go up in value (don't take my word for it, several dealers have recently stated this)
And when in the last few decades have Rolex gone out of fashion?

This is not a sales pitch for Fitz either. If I had the spare cash to have kept the Milgauss (as an investment and for occasional wear), I would have.