I currently have 86 Nayax POS I've installed on my sites, every unit for sure needs an external stop button (not included). After major growing pains & up and down the chain of tech support, they recommended external stop buttons because they have no resolution for the screen stop button malfunctions.
I also agree with AnalyticWash, it was a major pain in the butt to get all my units to be "Heartland Direct" for processing... we save a little $ on processing. BUT, main issue we did it for... we hated our customers seeing "NAYAX VENDING 69" on their bank statements... we had many calls/ complaints thinking their cards were 'hacked'. Now it says our business name as it should.
Also we were able to get the category for carwash on processing set. With nayax it was a vending food category. Some business customers would get declined because there business didn't allow their cards to be used for food.
we are happy with Nayax for sure - every unit count up.