These are comfortable and form fitting right out of the box. I've been wearing them for about seven hours since they were delivered. I've walked around outside a couple miles and have been wearing them around the house. They are so light I forget how substantial they are and they have great traction and ankle support. The stitching and materials look sturdy for the weight.

Part of why they are so comfortable is that they are so thin and flexible. The top and bottom are form fitting and natural feeling but I do want to say that these are not heavy/protective boots at all. I would not want to either take a blow to the toe wearing these or have to walk on rusty nails. These are light to medium hiking boots and great for it, they are not heavy or winter boots.

P.S. - the sizes listed were RIGHT ON, so right on that I'll have to break mine in a bit before I can wear a thick pair of socks under them. If you want wiggle room I recommend you buy 1/2 size big.

EDIT: Update 2/21/2012

I'm prepared to give a more experienced viewpoint now and, I'm a little bummed to say, I can't in the end, give these my full 100% approval rating.

They are still comfortable while being super thin and responsive... but, while there can be benefits to feeling the contours of every rock you step on while you are hiking, this can actually become annoying in the every day world.

I really, REALLY wish they were just a bit taller to provide better ankle support.

The traction is fantastic and, even while wet and on slippery surfaces, I've never felt like I could "lose it" and crash.

For the right situations and endeavors, these are hands down the best shoe I think you could select (I'm thinking of climbing, parkour, etc).

For every day footwear I think they are a bit too sensitive and low-cut.