Depends on ingredients - Bulletproof branded coffee is OK but to mild and bland for my taste - not as bad as American hotel coffee but nothing like Italian.
In UK Tesco finest Costa Rica coffee , filtered water , thermos drip machine (hot plate ruins coffee) Rachels Organic grass fed butter (like cream) then must be blended actually tastes amazing I sometimes add a little expensive GMC organic forest honey or Xylitol if I want zero carbs.