So I love the Xacto Knifes and if you do any art you prob need them.  These are a little pricey due to the set but for the box that is nice and the blades you get it was worth it for me.  If you just need the standard knife I would have got the cheaper one, but the box keeps everything so neat and you have everything there you need.  I'd buy this again if I needed it and I would recommend to others.