Just as I was really beginning to like this product, I decided to save my PDF, and the following message came up: "Upgrade to Remove Watermark".
Not for me, I'm afraid. Paying to download a program which is offered for free after having paid for it, I don't think so.
If I'm wrong, I welcome correction, and if there is a way I can save my work without the watermark, I will definitely reconsider.