We did a 4/3 b2b instead of a 7 day. The plusses were:
got 2 trips toward platinum
2 cc days
was able to score a cabana on the 3-day (maybe b/c there were more 1st time cruisers, or maybe 3 dayers are more budget conscious???)
the night before turn around was awesome knowing that our cruise was only half over, not ending.
Turn around day was cool, being the last ones off and the 1st ones on
Everything else was kind of a letdown, and we will always choose a 7 day over a 3/4
the turn around day felt wasted
We thought we'd enjoy repeating menus and shows, but in reality everything was kind of a letdown having just "seen" them
we prefer the atmosphere and the "vibe" from the 7day better. the 4/3 fellow cruisers felt rushed and not as relaxed (not sure how to describe this)
prefer the 7 day ports instead of nassau 2 times
So, I'm glad that we did it once, but we won't do it again