with the other brush, i had to go over the wavy areas several times to get it to lie flat. the base of the brush gets extremely hot and since i used my other hand to hold my hair straight while brushing, i actually burned my hand a few times while using it. the results were the same. my hair was definitely straighter, but i still miss that glossy shine that i get from the flat iron.
here is a video showing how to use the electric hair straightening brushes. i used one brush on one half of my hair and the other on on the other half. you can see 