It’s usable, and for free I can’t complain.
I’m tempted to check out Sheetcam, however I’m not sure if it’s much better. For me the biggest issue I have is with lead-ins in general, and how the software just doesn’t appear to be intuitive.
For example it would be GREAT if a program just treated interior pieces with lead-ins that match the size of the hole, or at least let you set where you want the lead-in to occur. (unless you can do this and I’m blind).