yep, you have to slide one monitor halfway off to turn it vertical.
I think woot fudged that example photo a bit, these monitors will be almost if not completely OFF the stand's slider arm if you were to space them so far apart, as in the pic. i can get about one inch between 'em.
No big gripe, just kindof a misrepresentation for those (like me) who were thinking "oh i can turn that right monitor easily to look at portrait shots".
I need a screwdriver for that...lol.