[FrenchTouch42]

I think the main question is: do they need your product?

It seems to be the case, which is why I strongly advise you to not make it "free" no matter what feedback, help or features you think they'll bring to your project.

Instead, think of them as your first customer. You might get 100 more or only one. Charge them the cost of the software and foster a special relationship with them, maybe in terms of support or beta features, whatever works for you.

Good luck!