I just got my new DeSoto T1. (I got the TRES bottom–saved $50 over the T1 bottom) I found one advantage that I’ve not seen mentioned before. Even though I was in a relatively cold (competition) pool. I got hot. All I had to do was briefly lift the lower part of the T1 top and it filled with cold water. Try that any other wet suit.
Also, the sort neck was great on my big Adam’s apple.