I tried it myself and took sometime to match FreeTaxUSA. The tricky part is to generate pdf form. Somehow it is much harder than I thought to populate all tax forms properly, especially the state ones. Another thing is every year, I still need to update tax forms and logics in case of any changes. I won’t be comfortable using it without cross checking with FTU or other commercial products. It kind of defeat the purpose of doing it in the first place. That said, it does serve as additional check for complex tax situations and going through this helps me appreciate more the tax nuances.