I'll look but I've never seen an Omega that wasn't centrifugal-how could it do grass.
I'm still leary of juicers that advertise "grass & juice". grass requires closer tolerances than veggies for BEST quality.
For "juice therapy" Vita-Mix is not the juicer to use.
Make sure you get the 'extra' plastic screen for dehydrator. You don't want your food on metal screen, plus its easier to cleap clean.