We make vodka on an old iStill250 with the upgrade Genio column. Second what Skaalvenn said, makes good vodka but VERY slow. We run low wine strippings of about 30% ABV through it and if we fill it to the top (close to 250L), the run times are 16 to 20 hours. On the positive side, once you take a few front cuts, its essentially fully automated so you don't have to make any adjustments while its running (we still keep different cuts but its largely unnecessary). Good kit just very slow.