Quite a strange experience this. Took out $500, got a message on the screen stating that the machine was now broken. Thankfully it gave us the cash and our card back.
I've given this 4 stars because it added to our experience of Costa Rica. This also seems to be the only ATM that we could find anyway to dispense dollars. Something to think about if your accommodation doesn't take Colones. The other way is to take out Colones in town, and then exchange at the info centre (internet cafe) but you will get screwed there with the exchange rate and their fee.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.