These titanium Yamamoto neoprene suits are awesome!
I happened to call into the Seventhwave Christchurch factory a few years ago when I was down there from my home town of Raglan and brought the second one these guys had made the first one went to DK who had just been down to Catlins. ( I think this was when he did the paddle in to those monsters?)
I surf at least 3 days a week and during daylight saving sometimes every day so it has been hammered. For North Island the 2/3 is great. During the coldest winter sessions a fleecy rashie underneath keeps me real warm. The secret is the really close fit and therefore a thin layer of water that will get warm from body heat quickly. You would have to go up at least another MM to get the same warmth out of an old neoprene suit. One of the best things about these suits if you surf a lot is the flexibility this neoprene is super stretchy so you don't feel like you have had a workout with a rubber band after a long session. The extra cost is absolutely worth it. My original is still going strong and will make a good cut down to a spring suit."