Sharkskin is heavy enough for me to find annoying, so I save it for northerly trips in the winter.
Quality was great. I would own six pair and rotate them through the dry cleaners, they would last for many years. They probably don't last as long if you wash them at home. Only issue I had was a dry-cleaner I used for a while must have been using some illegal toxic chemical because it turned the rubber waistbands into goo which would then ruin shirts. I got new pants and a new dry-cleaner and never had any further problems.
That said, since the pants lasted long, I haven't bought any new ones in years, so I can't speak for today's quality.