I like that it's easy, intuitive & simple enough anyone can use! It makes our life easier in so many ways - not only creating presentations but also sharing them with people via email or even just by attaching an image is super straightforward thanks to its simplicity which we love! There are some minor bugs here n there (like when you want multiple slides per page) however they're pretty rare as well :).
We've been using this product since 2010 without any problems at all though sometimes if your computer has slow performance then things might go really slowly especially during animation mode where each frame takes ages!! So make sure yor system meets their requirements otherwise u'll have issues while working w/o glitches ;).