Jackie,
We are using a Graphtec CE6000. It took us a while to find the right combination of blade, pressure, speed, offset,and no telling what else. I think you would be best served by posting specifics of the issues you are having so that Forum members can give some advice as to how to address the exact issues you are having, rather than starting over with a different cutter. Just stating that you are frustrated does not give much information to help determine the fix for the issue. What is the basic problem? Depth of the cut? Not cutting circles, but ovals? Not cutting the entire design? Starting and ending point of the circles not meeting? What is the issue you're having?
Dane