I currently work in a restaurant as a server and I hate these damn things.

At least once a week one of them starts to update indefinitely.

When someone uses the call button it simply puts a blinking light on the machine at the table which is annoying as hell for the guests and draws extra attention to the time it takes to get to the table.

The pay at the table screen almost never works right.

People complain about the $1.99 cost for unlimited games that their kids accepted the charges for because they didn't pay attention even though I respectfully let them know about it ahead of time.

Half the people don't even want them on their table.

The gratuity is in a slider that starts at 20% as the middle ground. If you don't adjust it, your server gets 20%. Most people don't even look at it. Nice for the server but a bit of an underhanded way to "earn " money.

It's more trouble than it's worth.

This isn't even considering the fact that the food service industry is one of the few places people can work and make a semi-decent living without additional schooling. If it becomes automated... Game over man... Just game over...