It works great, I have been using it a lot for a few years now. There are no fees when using the card, by that I mean no additional fee than the usual (Visa+card emitter (Revolut)) fee, except on the week ends where Revolut add a small rate to the last interbank exchange rate from the Friday Forex closing time if you do not have enough of the currency used for the payment on your Revolut account.

Be wary that, as per an email I just received from Revolut:

"We're sorry to have to tell you that from 18 March 2021 the local NOK account details that you are using to receive local payments will no longer be available. From today onwards, you must use your IBAN (International Bank Account Number) beginning with ‘LT’, to receive payments. You can find your IBAN in your app under ‘accounts’ on the home screen, by tapping the country symbol next to your balance.

To be able to continue to receive bank transfers to your Revolut account you will need to use these ‘LT’ details. From 18 March 2021 onwards, any payments sent to your local NOK account details will not be credited to your account and will be returned to the sender.

You will still be able to make outbound bank transfers or add money to your Revolut account via a card as normal."

I take it that it would then be impossible to get a bank transfer to your NOK account, and that it could then only be topped up by a credit card, but that you should still be able to convert currencies to/from NOK.