I too just got mine, I've so far taken them on one trip where I wore them in my hammock when it got down to a windy 40 degrees out.
I like them fine so far. Based on the (previous?) sizing chart I was suprised to see that I fit into the "small" category; my legs are relatively short (size 30 inseam), and they do fit, but I think that I'll generally wear them *under* my hiking pants in camp and at night --- they're on the snug side when I wear them outside the pants. I like this approach actually; a little more hassle putting them on and off, but this way the relatively delicate material is protected by less expensive and more durable hiking pants around camp.
I do like having more of the warmth of my sleep system in my clothes --- it makes it a lot easier to get out of bed in the middle of the night or the morning. It can be a hassle, however, when the night starts out warm but turns cold.
Mine seem to be of excellent quality, and my size smalls weigh 185 grams, or 6.5 oz. But I notice that the sizing chart and size options have changed (if I recall correctly) since I ordered mine, FWIW (?).
One other issue is bulk; akin to a sleeping bag, I can squish these down small if I want to, but I'm inclined to not squish 'em too much, and certainly not when storing them. Something to factor in, anyway.