Of the half Ironman I've completed (Austin, Vineman, Rev3 Knoxville, St. George), I find this swim the most challenging. The salt water provides nice buoyancy, but it's crowded in the harbor, and visibility can be limited. After several miles of a flat ride, the bike gets quite hilly, and you can hit some head winds for the last few miles. The run is mostly flat, great for fan support. I've done this race twice, and plan do enter again next year.