I love how easy it was to create my own custom application with all its features, like auto invoice generation upon purchase completion, emailing customers about their orders etc.,etc..
It took me less than an hour to set up everything that i needed in order to have this working perfectly! The customer support team could be more responsive at times but overall they are very helpful when you need them most! There's nothing much really bad that i can say about simplifi (other then maybe some lag time here and there). So far so good!! We're solving our problem by using simpilfi which allows us automate sales process within our organisation. The best thing about simplifi was its ability create my own application from scratch, I also liked that it has an excellent support team who were always willing help me when i needed them most! Sometimes they are quite slow in responding but all things considered this software works perfectly well so no complaints here at least not yet :) Also if you have some knowledge with wordpress then their api integration will be perfect because both platforms use WPML which makes communication really easy too.