I absolutely love G-Wizard! It makes the task of checking G Code a pleasure, and above all - fast!
What I learned as soon as I started using G Wizard Editor is that it goes hand in hand with G Wizard Calculator. Together these two speed up your machining times quite significantly with no tool breakage or ghost machining.
I bought a one year subscription, but plan to upgrade to a life time sub simply because I cannot see myself without G Wizard in the future.