I like that we can test different designs before publishing to make sure they are up for our readers' needs (e-books). The software is easy enough even if you have no programming knowledge or experience at all! They also offer great customer service when things go wrong so far as making changes etc., which makes me feel more comfortable using their products than other companies in this space do now days! We're still working out how best use it but overall happy customers who love what's been done already by them - thanks guys!! No issues yet though just getting into testing eBooks online only right know rather then having an app first where users could read books offline too while waiting/testing new design ideas /features of eBook version itself.. Our goal was mainly focused around ease & speed from designing till fully launched product ready versions available through various.