If you have the money to get better I would. If not, then it is not bad to use at all. When I was doing low tech tanks way back when I first started I used the media it came with it and had no problems ever from it. I have since started using more "fancier" media.
I have bio balls in the bottom tray, Ammonia chips in the 2nd to bottom tray, Boyd's Chemi-pure in the 3rd to bottom tray, then filter floss in the top tray. Been doing it like that for the past couple years and I have never had any problems. Water has been crystal clear and perfect parameters.