I've used both with the chicas with no problem....I do ask them first, to make sure it's alright. Restaurants, taxis, etc.....a little different. I think the taxis and Tico restaurants prefer colones.
The last night I was in San Jose [Feb. 11th] I had used up all my colones, and had only dollars on me. I was a little hungry, so I decided to go to one of the "true pillars of American enterprise"........McDonald's, where they had no problem at the cash register.....just push a button and convert the colone amount to dollars.
Zebra