Vortex Sound Research

Other than DUSG being able to track better when the audiorate is in oscillator territory and Maths having the benefit of attenuverters, I haven't been able to find much on what else sets these units apart. Has anybody got any experiences with both? I'm just curious as to what warrants the bigger pricetag on the DUSG. Is it just the lore? I must admit, I watched a couple og mafmadmafs Serge videos and I'm quite intrigued by the DUSG.