The payment performance is great, but I have witnessed several merchants struggling with the hardware. Granted, mostly due to not having (m)any customers for it, so the devices are mostly out of battery and staff doesn't know how to operate them, leading to lots of frustration . Besides the UX of the buttons is pretty bad/counterintuitive (if you actually press them, and not just touch, they won't react).

Reported back to Opage but it seems they are not actively reading Nostr.