I switched completely over 2 years ago. Very happy with the app and API. Happy to see that other banks are imitating BUNQ, it's really moved the banking experience forward.
On the other hand: BUNQ doesn't yet break even, uses new technology that is risky, and is owned by one person. So it can end and it can end quickly. So I would recommend keeping a second account with some money on it and a card you can use for shopping or rent/mortgage payments.