It's really easy, fast and useful for my daily work as an accountant. The user interface is intuitive and simple. I like that it works in real time without any need of downloading or installing anything else than what you already have installed on your computer. And since it has been always available online, no more worries about losing access to it if the internet connection drops suddenly! Nothing particular comes to mind. But overall, this software seems very reliable so far. As mentioned before, I use it every day with ease and comfort.