they are actually not a bad option if you do a lot of touring and have a quiver for touring.
obviously, they are not the tool to use in spring or hard conditions but...
for storm touring, slackcountry, and in the days after a storm, fat reverse skis are awesome for touring. sometimes it may seem like the skintrack is too narrow w/ fatties, but you will honestly find yourself the one breaking trail (and its easy w/ fatties). having a fat reverse reverse touring ski opens up options as far as terrain selection and lets you have a ton of fun.
the downside is weight. its worth it on the way down though. also, check out the new frischis. they're stiffer, and have a much beefier heel lock than past models. dukes are sweet to but having to take the ski off to get into ski mode sucks.