In a word, Warmer.
What information are you looking for?
The enclosure is in the way compared to not having it up but this factor is outweighed by the added comfort. It does little to nothing to affect the performance of the boat. Just make sure the Bimini is tall enough for you to stand under without hunching over. Also, the enclosure without the walk through canvas in place is like putting on a winter coat without zipping it up.
Hope that answers your question.