I used their openstates repo a while back and found it amazing how well they could distill the data. I had tried writing scrapers before for the same purposes, but it took forever just to get a fraction of what they had. Best of luck to sunlight devs in the transition.
I don't expect this to be free. My point is that pricing should be clearly stated on the landing page for the product. You should have a pricing link or header, even if it just says "free for now, we're working on pricing".