I love the CG rulers.The black and white markings are easier to see on different color fabrics. I like the 1/2 inch feature on one edge. You can always add more dots to the back if needed to help with any slipping issues.
You may want to re-check the cutting technique if you get slippage when cutting. Check that the table, mat, and ruler aren't bowed in one area. Make sure to apply firm pressure on the ruler.
Technique-Watch the position of the left hand on the fabric.
https://www.youtube.com/watch?v=XfvKE0Y6npk
I have 2 -3 QS rulers and just not a fan. The frost color and all those markings aren't working for me. I use the long ruler as an extension when cutting long pieces. Otherwise it hangs on a hook.