Hi all,
I use the 'Hot n Dry' brand (made in Aust) dry suit through the winter months. Have used it since 2002 and it's still going, but had to have the neck rubber replaced a few years ago. Only wish it had a pee zip, which can be ordered with one. (Should have got fitted when the neck was done

)
I wear clothing underneath, how much depends on how warm you want to be.
I still get slightly damp from sweat and a bit of water getting in, but don't get cold, even on the worst icy southerly.
Might be a tad bulkier than a wetty, but you forget that when you are warm as

Also find hands a feet stay warm longer, because body core temp stays up.
The 'Hot n drys' are pretty thin so youv'e got to be a bit careful around rocks or anything else that could punture the suit material.