Lava Core as you already noted, is neutrally buoyant. In my experience, it is roughly equivalent in warmth to a 2-3mm wetsuit. I have a full top and full pant lavacore and am comfortable to 78-79 degrees-- but that is a very personal thing. Any colder than that and I am getting into my 5mm neoprene wetsuit. Any water in the 60's or below, I am in my drysuit. Life span for the lava Core is every bit as long lasting as a wetsuit, if you take care of it. I like that it can be washed in the washing machine and dried in the dryer. I like that it is 2 piece for going to the bathroom and makes it easier to don and doff. Although, I do find that the top is a bit challenging to get off, since there is no zipper. Putting it on is a breeze though.