Easy set up with an easy interface for my customers (I have been in business since 1998). I use this mostly as part payment reminder notification that is sent via email or text message when they are about ready make their final purchase decision but not yet made it through checkout process! Sometimes you can't figure out why someone hasn’t purchased after clicking several links within site from other pages so using pop-up window helps me identify what page was clicked by previous visitor which leads back towards purchasing path if needed!! Very good product at great price point compared to similar services offered elsewhere online. No complaints here just glad we found another way besides paypal/credit card processing to collect payments. ! Definitely worth trying especially now days where more people rely heavily upon credit cards instead cash transactions - even small businesses should consider doing same. !! We were able sell our service without having any issues collecting money because customer.