Unfortunately I've had the distinct displeasure of flying on InterCaribbean at least a bunch of times. IMO hands down the worst "airline" in the history of the world. You need a bag of gold to purchase a seat and then you can count on the flight being delayed, delayed, delayed, delayed again and then finally canceled. They left me stranded on more islands than I can count.
Air Century on the other hand is pretty terrific if you ask me. The fact that they stock a handle of Brugal in the stew cart instantly wins on style points.