Very powerful. You can build quite complex forms with e-mail submissions. Lots of variables that can be used to customize your e-mail submissions. Also the submissions management is very good. Fast support. I was given direct and effective solution in minutes. Hidden fields with the possibility to put some code in them are my favourite ones. With this feature, some googling, logic thinking, I was able to automate my site, despite of lack of PHP and Javascipt expertise. I recommend this extension! It is definitely worth its price.