I am in the process of supporting a large federal contract, and have decided on using mail merge to provide some of the mandatory reporting that is required for this contract. I have a macro that generates the required data in an Excel sheet, which then becomes the data source for my mail merge process. It works fine but the mail merge that comes with Word is very dated. I don't believe it has changed much in the past...umpteen years that it has been around. Because of this it's not very flexible. So when I saw this tool his AppSumo I was shocked. I didn't think anyone even used mail merge let alone supported new development in this space. I've been pleasantly surprised at the new capabilities this tool brings to this space. AND I just found out that they've released yet another update that allows you to specify the "reply to" email address. I can't wait to try it as that will improve my overall process significantly.
Also, I didn't know this until recently, but they also have an entire suite of utilities available on their website. I even used one of their Excel compare utilities. These people clearly know how to build quality tools for people who need to roll up their sleeves and get things done. (I'm trying hard to not be one of these people but I'm not there yet. :-) )

Thanks for bringing this tool to AppSumo!