What do you mean warm out of the box? Heating up fast? The cutesliving store has a pair for 38€ during sale so I'm tempted but I'm afraid those rivets might fail like tracevelo has reported on his - they weren't kactus but the rivet looks very similar. Price seems a bit steep if compared to the zrace that goes for 10€/pair and there's no claimed figures to compare them
By the way the CD-01 are way overpriced in the last link, it can be had for 1/4th the price in other stores