I don't find a lot of waste using my cutter. Not enough to worry about.
My only problem is that many times I make patterns that don't use any of my dies. And I also don't have a dedicated space for mine so it's a bit inconvenient right now. I need to fix that because it's a wonderful invention.
I have the Go and the Mini and I use the min i a lot. It's small and easy to set up. As I said I need to find a dedicated space for my big one.