Unless things have changed recently, the roxy skis are just dynastars with a different top sheet. i ride the black magics from a few years ago and they are the same as the dynastar big troubles. this same ski was also used as one of the dynastar women's models and one of the coreupt skis.
They're generally pretty easy to get cheap/on clearance because people won't look beyond the brand but I've never been unhappy with mine. Honestly, the worst thing about about them are the smirks I get from guys on the chairlift.