I can't judge that right now. I'm just not a fan of these DIY store crutches at all, have experienced it many times with friends and family. It just gets way too hot very quickly, which is uncomfortable and you end up just airing it out.
With our brick one, luckily that effect doesn't happen. I find it fantastic when it stays warm for a really long time and is still lukewarm in the morning. Great. But of course, it costs more, you can't compare a Porsche and a Dacia.