Does this unit have the swiveling second stage?
The only thing it would provide you is a nice clean first stage, and no water contamination internally.
It does make it easier for servicing. No other benefits, really, and there is no downside, except for the increased cost for servicing due to the christolube. No more than $5-10.
Sealed means that the first stage is filled with christolube and closed off to the environment.
This is good for first stage freeze up protection for cold water.
So if I live in Florida, and don't plan to do much cold weather diving, if any, what would the feature add for me?
Is there a minus?
Yes, it has a swivel.
One other question- what is the difference between the "sealed" and regular versions?