Spacecase Ultratherm iceboxes

Has anybody used the new Spacecase Ultratherm Insulated Containers as iceboxes?

They are sold through ARB. They look pretty tough but are on the expensive side. Sometimes good things are expensive, but its nice, before you lay down dollars to have a few reasuring (or other) opinions.

What I'm keen to work out is if they are better than the Downunder or similar type ice boxes. I have seen many types including the Ultratherm but can't really judge their keeping cold 'abilities' .

For my type family car trips they are mainly 3-6 days away. We want to keep the size on any icebox to a minimum. When we camp we mainly take dry food stuff but some food and of course some drinks need that 'icebox' treatment.

In terms of volume I look at the smallest in the Ultratherm range with outside dimensions are 62 x 42 x 34 cm. (Inside 56 x 36x 27 cm). This sort of shape also packs well in a smallish vehicle.

Can any one offer any performance comparison information?

Thanks in advance, Family camper