It's simple, easy-to use system with no frills or bells & whistles -- just something I like! The only thing about this one was it did not work well for me in Firefox; but as soon an update comes out then all will be good again!! Great product so far - nothing really negative here at least yet :) Have been able do get emails from my website visitors whether they are still around our site OR have already left AND can also send messages right away via sms/email if necessary (or both). Very impressed by how fast we were getting people into lists of customers who wanted more information / products etc.. I like that you can create an opt-in form for your website and have a landing page. It is free and easy to use. The only thing I dislike about this software is that it is not as customizable as I would like. I would like to have more control of the opt-in form and how I can use it. I have been able to capture more email addresses and website sign-ups for my business.