Very cheap and easy to assemble. A me è piaciuto. Bottom line is Im not currently using it as much as I expected or hoped I would, but if you have the right setup (and pick the right resistance) this should work for you. If youre on the fence about getting them, get them! Sin duda una gran compra! I finally replaced them with this little beauty and just put pictures over the old holes in the wall! I can happily report that whatever they did do these, makes these sound nothing like the 990. As soon as I slipped them onto my feet, I could tell these were winners. This mat makes it possible for me to slide the kayak up onto the roof rack crossbars without tearing up the back edge of my SUV roof. Which is great for hand free reading or streaming.