Is there a compelling reason you are switching to FLAG

I don't know that I am switching to FLAG. I just heard about it for the first time the other day. I don't like Graffer, and ever since the last update, the e-books produced by FF Downloader have had some odd formatting issues. I've been having to edit them in Sigil. I'm willing to keep doing that if I have to, but if FLAG is easy to use and outputs a nice looking e-book, that would save me some effort.