User-Friendly Software
Ignoring comments from those who has used other accounting solution, this should be judge by someone who has not use or heard of the software to be objective. Just like asking a Mac user to judge Win operating system. It tends to be bias.
Second, focus on operation. Can you understand the screen? Is it easily understood without explaining?
Next, try to get someone to show you a demonstration base on your operation. See if how fast or easy one can create a transaction or search a transaction. If you are not familiar, you will not be the best to judge if this is really user friendly. So doing this gives you an idea when you are in it for a while, is it still as simple.