Yeah, that's about it. On the 125-1000 (Hawker 1000), vortilons are just more elegant wing fences. They replace sheet metal, replacing a pyhsical barrier to outboard flow with a strong vortex which goes over the upper surface, thus providing an impenetrable barrier of high energy air instead. The end result is the same, less outboard flow, desirable inboard flow separation first (less rolling moment), no unpleasant/uncertifiable wing drop, and the aircraft doesn't look as ugly to boot. Although, mind your heads - they're pointy (or knees on the -1000).