At first I was impressed, when cold and hard...the tyre maintained a bigger size giving more overall speed but less grip , then when the tyre got hit it performed like a sponge it was so squishy the cart went slow... Folded off the rim a few times... (I was able to stretch it back on by hand)
Then when I parked it over night it cooled down under its own weight causing a massive flat spot to be formed and undrivable.. I have pictures and videos.

It seems to me the working temperature range of the filler is effected by heat to easily . I'm going to need to buy more tube and normal tyres...it was a good thought tho and probably fine for light riders