This seems like a great concept. The plug-in covers the things that a lot of people would like to have, and what's there is pretty good. But I've had some issues with the interface--and then with the people who are designing the software. Specifically, I lost a lot of work by inadvertently hitting (something?)--then learned there was nothing in place to save drafts or backup. Apparently, the Wysija folks took issue with my tone (frustrated, not nasty) and got very defensive. I didn't think much about it.
More recently, when I returned to a WordPress install I had been working on for quite a while but had moved to the back burner, there was a message to update Wysija, which I did. At the end of the process, there was another message from Wysija, apparently very personally addressed to me and/or the organization for which I was building the website (a non-profit kitten rescue operation), saying that they had to get "stars to keep from killing more kittens." Personally, I place this in the realm of the completely bizarre and warped and--obviously--not professional or competent or even entirely sane.
There are other programs. If the Wysija people think "killing kittens" is cute or funny or clever, then I think a lot of people will want to explore those other programs.