Owen James wrote a review of Arc'teryx R320a Rock Climbing Harness - Men's on July 6, 2011
I purchased this harness in Men's Large and found that the waist belt and leg loops were not true to the sizing chart; both were 2" smaller than advertised.
In the end, I went with the Arc'teryx 350a All-Around harness instead which fit closer to the sizing chart, but also has adjustable leg loops. The R320 is admittedly lighter than the 350a, and seems very comfortable. In particular, I can see the benefit of removing the buckles from the leg loops to save on weight, instead relying on heavy-duty elastic to make the loops dynamic in their sizing.