The ability to manage the tax compliance at the customer end and having the most updated tax laws. The interface is very user friendly. I have not faced any technical difficulty during my work. The most interesting part of this software is that it always comes with the most updated tax laws. I would recommend this to all the small and big level businesses. The most important thing is that this software is very user friendly. I have not faced any technical issue while working on this software. The ease of use, it's compatibility with both MAC & Windows platforms as well easy to integrate into existing systems such that no training or support needed for end users (IT managers). 1) No GUI customization2.) Not compatible w/ Microsoft Dynamics GP3.). Lack adequate tools like Data Import Wizard4.), which makes system look outdated5., lack integration ability6), slow response time7,) does not work at all8).".