I love these leggings. They are the most comfortable leggings of any kind I have ever worn. The wool quality is wonderful and the style is good. While I don't feel that the seams inhibit movement in any way, I did feel it made them a bit uncomfortable for sleeping in and limits the stretch of the knit fabric, however it does make them look more flattering, especially for the backside.

I initiated the leggings on an overnight snowshoeing backpacking trip and wore them under flimsy waterproof pants and they performed very well. I was plenty warm enough. The seams were a bit uncomfortable when sleeping on my side and I think I would recommend side-seamless heavier weight merino leggings for sleep.

Since the overnight trip, I've worn them running, walking, biking, to the office (under skirts), and just around town. I look for any excuse to put these on!

Pros:
-most comfortable waistband on any leggings/tights/etc I've ever experienced.
-great styling. I've worn them to the office quite a bit, under skirts and tucked into boots and they look great.
-great merino product. All the benefits of merino wool: warm, no stink, no itch, breatheable. Warm enough to be worn alone when running (see con below however) and they don't start to stink. I think one week I wore for running and a few days later desperately needed leggings and dug them out of the laundry to wear to work and it was fine. Only I knew that they hadn't come straight out of the clean laundry.

Cons:
-side seams. I think this is really only an issue if you are planning on sleeping in them.
-thinness of the fabric. They're plenty warm, but just a little too see through to wear by themselves. I've worn just these leggings with a t shirt on top for night runs, but I wouldn't walk into the grocery store (or any well lit place) afterwards. So even though the style of them is great and looks very flattering and the waistband doesn't give any muffin top, pretty much no one will ever know because you really can't wear them by themselves. That is the reason I gave only 4 stars.

Overall I'm very happy with the purchase of these leggings.

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July 2013 Edit
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While I still find these leggings extremely comfortable, I have a new contender for most comfortable leggings I've ever worn! The Kiwi Co Cable Knit fashion leggings are even more comfortable than these.

However if I had to pick leggings to survive in, I would go with the smartwool any day. Now that I've worn my smartwool leggings around the world, international flights and hiking over mountains in winter, I know I would trust these leggings in nearly any scenario and it's become a necessary part of my wardrobe.