I love that the battery is replaceable with ones that I can buy at almost any store. I cant get him to put them down! I read a lot of reviews and was a little nervous about the quality, but I was not disappointed. Would definitely buy it for myself or as a gift again. It feels sturdy when it is folded up into a stand. Es un plásticomo raro y feo y aparte estan muy anchas. Non le ricomprerei The interior removable sole pad did NOT break down or squish flat. So, when youre walking or running you here the echo of your footstep in your head like youre under water. Such a good value when compared to other offerings in the market and it is very thoughtful to make it collapsable.