It really does depend on what you usually make. I think it's great for the drunkards path, pieces with rounded edges that are difficult to cut. The drunkards path has a cut little notch on each piece to make it easy to sew together. It's great for applique pieces and odd shapes.
another option is the quiltcut if you do mainly simple designs-but it also has some drawbacks. Wouldn't it be nice if we all had the space, money and time to get all the cutting systems to fill all our needs/wants/desires?