Yes, agree with all other posts. I have the same Origo 3000 2-burner unit, and love it.
Use Ethyl Alcohol (or methylated fuel substitute) only. Denaturing alcohol is the process of adding poisonous stuff in small amounts (acetone, whatever) so it's no longer "drinking" alcohol. Over-proofed rum would probably work fine, and likely smell nice as well.
The soot issue is hit or miss. I have had cheap hardware store alcohol that worked just fine, and likewise have had expensive "no soot" boat alcohol that stunk up the cabin, and caused soot on the pots. Just depends on what additive they used to denature the stuff.
Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA