Don't use them - they are NOT a bargain. We took a cruise and were stuck in a cabin next to the engine - did not know this was possible.
Was told that we "should have known" since the plan of the rooms was on the web site. Didn't see anything saying that the engine was next door! We were always docked the farthest away from towns. The agents also messed up our air reservations and then didn't answer calls.
Bottom line, uou might get lucky and 1) get a decent room and 2) get a knowledgeable rep.
But if you are spending four or five thousand dollars, why take a chance? We will NEVER use them again and strongly recommend that you learn from our experience!
Product or Service Mentioned: Gate1travel Cruise.