I used Flux for a while to learn how it did what it did. I also wanted to compare the flow of Dreamweaver vs. Flux vs. Rapidweaver. Clients were asking for web sites and I had to figure out what was easiest to use. For modifying Wordpress, Dreamweaver. For building ready-made sites from templates, Rapidweaver. I never did figure out where Flux fit. So I stopped using it.
Then, just recently, they started SPAMVERTIZING their products to the former customers. I explicitly said "Don't contact me" and up until recently, they didn't. I figured they hired some new marketing person who didn't understand "opt-out" or thought there was a statue of limitation on it. They sent me SPAM twice despite saying "We only send email" on their Twitter feed. I looked at their web site and that explains a lot. They also sell a tool to do bulk emailing. So I guess they were dogfooding.
I'll steer clear of this company and their products from now on.