I traveled on the Carnival Inspiration twice this year. Once in May (Monday - Friday, 4 day cruise) and again in August (Friday - Monday, 3 day cruise).
Both times were very enjoyable though I would suggest going in the middle of the week (Monday - Friday) cruise. The crowd is much quieter and filled with older couples, young families and just people who are there to relax which is more my scene.
The good: