I've stayed in Montezuma during three trips to Costa Rica. The first was because we were traveling on motorcycles and ran out of daylight. The next two were because of our dining experiences at Cocolores.
The meals are very, very good. During each visit, our dining party members have never been disappointed but the one item that really draws me back is their Mediterranean style ceviche - white Marlin served in olive oil. Wow. Get one order for yourself. You will not want to share.
One caveat though. As great as the food is, we've had two experiences where the wait staff have been curt and emotionless instead of the typical Costa Rican friendliness. Normally, this would be a deal killer but, in this case, the food rules.