The other (and for me main) advantage of all merino is it doesn't stink - EVER! When wet it sometimes gets a 'wooly' smell but merino is naturally anti bacterial so it never smells like me. In the summer I wear a light, short sleeve merino jersey every day, wash on the weekends (only because I think I should).

Second advantage - merino is the only fabric that retains heat when wet. I didn't believe this until I rotated between merino jersey layer, polartec, windbloc, etc and it's true. The merino can get soaked with sweat and still feels warm (though clammy). Can you tell I like merino?! My experience is that plain wool is good but merino is very different. I also stay away from merino blends. Downside - the stuff is expensive (but lasts forever).