I use a quadratic sidecut on all my boards. Rides description of a quadratic is very inaccurate. I`m not sure if they lost it in the translation from the engineers or it`s just marketing buzz. There is so much more to the board than just the sidecut shape. If the flex pattern doesn`t work with the sidecut, it doesn`t matter what the sidecut shape is. It`s vital to look at the entire picture in order to make a board turn or hold an edge well. You can`t shop based on such buzz words. You`ve got to do your research based on how the board actually performs. Rider reviews are great if you don`t have the ability to test the board.
www.boardreviews.com is a good one. There is another for freeride stuff, but I can`t remember the site link.