So far I've had very positive experience with Icebreaker products. These shorts definitely follow along those same lines. Most striking about these shorts is the quality of materials. Everything seems very well built and long-lasting. They are definitely a little thicker than traditional lycra or spandex shorts. Even with the wicking properties of the merino, I wouldn't recommend these for an all day ride in the summer heat. I think the synthetics breathe better in those environments. However, these are fine for morning rides in the summer (85� or lower) and longer rides in the fall.
Pros: Seriously well built, I can't stress that enough. Stitching and materials look to be top notch. True to size, these are not European cut. I am 6'3, 240, wear 38 in pants and the XL fits fine.
Cons: Chamois is a little on the thick side. This could just be a personal preference or that I have gotten used to the 2XU chamois, but these seem a bit diaperish while walking around and the stitching where the chamois meets the shorts chafes just a tiny bit.
I'd rate these an A-, they are very good, but they aren't perfect. I would recommend them to others.