The ease of use to create new accounts for our customers as well as their internal employees (to manage payroll).It's also very easy creating invoices/receipt bills with this software that are automatically sent via email or smtp server directly from your computer! Nothing at all! I am currently looking into other aspects such us time tracking etc but i have not found anything yet so far which could be better than what we already do now using Excel / Google Drive + Zapier integrations - it works great :) I like that you can see your billing statements from any device with an internet connection.
The ease of use for small businesses with several employees to access their statements via mobile devices or computers made me very happy about this system. It's not so easy for people who have difficulty reading/writing when it comes to paper bills. But everything else was ok as far as my experience goes.