Pros - good material, sizing and fitCons - Not for Long Course ComfortI have been using 2XU tri shorts exclusively for 4 years for my long course races. These shorts are a redesign and is a completely new product with new construction and new chamois design. The chamois design is wider than what was the norm from the compression shorts in the past, which is okay, even good for the bike. 2XU mentions that its new chamois is for the new split nose saddles which is also good since I use a spit nose saddle. The extra side padding keeps chafing down with use on the wider nose.The problem comes when you get to the run. I had a couple of challenges during the marathon, the new stitching technique on the new chamois and the new wider front part of the chamois for the split nose saddle. First the big problem is with the stitching around the perimeter of the chamois. This new Zig Zag stitching pattern uses a very course thread and becomes very noticeable as the pad gets wet and retains the moisture. This causes the pad to move up and down for each stride. The stitching in combination with the thread will eat away at the skin it contacts, a little like sand paper. With the previous version of 2XU compression shorts, the chamois would wick and shed the water and did not bounce up and down on the run. I think previous chamois padding is made of different material and there less of it.Just based on my long course Ironman experience using this model of 2XU shorts, I can only provide 2 stars. I will do a couple of Olympic and a half soon and may update if the experience improves.Chapped "butt" still a 2XU fan and will continue to use their products...