I love how easy it is to use, all of my clients are able so easily with this software! It's great for tracking invoices as well because you can go back in time when an invoice was sent out or received by someone else if needed without having any problems at that point since everything has been tracked already through naliu!! Nothing really but sometimes there will be times where i have no idea what happened after something got paid/sent etc.. But other than those few things its very simple & straight forward from start-to finish which makes using easier overall once we get into our workflow routine haha :).