Overall it’s a decent cup. It’s made of pure titanium and holds 600 ml, which is why I bought it — so the C8 oil I blend into my coffee wouldn’t have any plastics to react with.
The double-wall insulation is the weak point, though. When I fill it with hot liquid I can feel the heat coming through the walls almost immediately. Judging by the dimensions it appears to have a thinner gap than other double-walled containers I’ve used. I’d say the thermal performance is better than a ceramic mug, but nowhere near what I’ve experienced with other double-walled cups — and, frankly, a bit below what I’ve come to expect even from much cheaper insulated options.