Ease of Use with Hero Lab
I would say the only difficult learning curve would be using the Hero Lab software, because of how complex and powerful the software is. It is without a doubt the most powerful DnD character creating software out.
As for the Character Converter's ease of use you can test it yourself. You can download PCGen, make a character, and use that as a test run for the converter because the process is the same as Hero Lab. I can assure you though I have been designing it to be as user friendly as possible.
Let me know if I can help in anyway. Thanks for expressing interest!
Best regards,
Cody Stebbins