Four hundred bucks just to get someone to fix the mess I made trying to file with that software. I entered the same number three times and it gave me three different refund amounts. By the end I had no idea what was actually right or wrong. That's when you know it's time to just pay a real person.
Yeah, three different refund amounts sounds about right. I'm with @brooke_foster51, my own math skills are bad enough without software making it worse.