Sorry for the length of time it’s taken me to post since I went away, I got my Monzo pre-paid card just before flying to Jamaica and used it instead of my debit card while away.
The main point is that my card worked with every retailer and cash point I tried so had no problems at all!
We found Monzo invaluable while we were out there as we didn’t have to carry lots of cash around and keep visiting cash points. Obviously we did have to pay local businesses who don’t accept card with cash, and did need cash for tips but we used my Monzo card to get cash out in local currency to avoid big fees.
Previously we have always tried to take the total money for the trip in cash and take a debit/credit card for emergencies, but have always been worried about using them due to unknown fees and rates. We both got paid while away this time round so decided to book some extra trips while we were there which would have wiped out our cash. Rather than having to worry about how to transfer money across to the right person and trying to sort out withdrawing larger amounts of cash we could simply use the Wifi in the hotel to top-up my pre-paid card from either mine or my partner’s debit card and use that to pay for the trips and any other spending.
I’ve always found it hard to keep on top of what I’m spending while I’m away due to exchange rates and delays in money showing (being discalculate and unable to do maths on the spot doesn’t help either 
), and get hit hard when I get home and it all updates! Having instant visibility of what in £ has been taken off my balance I knew exactly what I had left to spend and it also gave me the USD amount underneath each transaction too.
I have recommended Monzo to people I know who travel a lot after my experience in Jamaica and they have singed up for these benefits alone, with the day to day features being an added bonus!
I hope anyone else here who visits this incredible island has an amazing time and find it as easy with their Monzo as I did with mine!
Happy to try and answer any other questions about my trip and using the card abroad.
Gabby