Not great. They are a couple generations behind the newest model. They also lack ED glass and dielectric coatings. Still, the Nikon Monarch name is worth something for some people. I'd say they'd be a good candidate for a long ebay auction.
They are worth more as truck optics than selling in my opinion. Seeing as a new pair run a tad under $300 I'd personally not pay more than $100-$150 used for a set in pretty perfect shape.