The greatest benefit that came from this software, for me, is the ability to conduct business, specifically, complete a payment transaction, no matter where you are located.
Square is an awesome piece of software to use. The retail side has great capabilities for sales, inventory, gift cards, rewards, and much much more.
Square is very simple to learn and use as an end user, and it has gain a lot of popularity recently, customers feel more and more comfortable with this system.
If I am to complain about something I would complain about the percentage I am giving back to square but that it the cost of doing business.
The only thing that has ever been slightly frustrating is the traditional card reader being sensitive when swiping cards. Sometimes I'll have to try 3-4 times to get it to register.
I dislike that it fails sometimes and it is not accessible at many different vendors and restaurants.