We have cruised with RC several times and always had a good experience. Recently we cruised on Harmony and loved it. When an opportunity came to sail on Navigator at a bargain price we said lets take a chance.
When you cruise in Sept or October you get the best rates since school is in session and its hurricane season. As far as the weather, you take you chances but we were lucky and had great weather.
Navigator is an older ship but she is well maintained overall. The pool area just received most of a 100 million dollar refurbishment. The pool deck on Navigator is as nice as anything I've experienced and is comparable with the newest and largest RC ships.