How many people?
If it is just one or two you will be fine. The cabin is a bit smaller and only has one TV and a "love seat" instead of a full sized couch.
I have sailed in both the mini-suite and in a regular balcony and overall I didn't have a problem with the size of the balcony cabin.
If you are sailing with more than two people then you will notice the difference and wish for the mini.
Take care,
Mike