Western Mountaineering is one of the better sleeping bag makers in the business. The Highlite is a summertime bag that is a dream to deal with. So lightweight, barely over a pound and it compresses down to the size of a Nalgene water bottle. I wish it had a full length zipper since I use a Hennessey Hammock but the half zipper is part of the weight savings and I make do. The bag is made up as you can see from the pic of sewn through seams but for the summertime camping I do, even in the Enchantments, it does the job nicely and allows me to pack everything I have in a small Saloman windraid 30L pack. The dimensions would make this bag a little tight for anyone bigger than me ( I'm 5'9") so I'd recommend that you actually get into the bag at the store before you buy it, just to make sure it will work for you. For summertime camping, a 5 star bag.
i'm a guide in the sierras and spend 50-60 nights on the ground every summer. i've had all kinds of bags in the past 20 years, but found what i always have been looking for when i bought this bag two years ago. this bag is soo compact, ultra light and totally appropriate for high altitude summer use in those mountains, combined with a tent and long underwear on the coldest nights. the fit is tight, but reasonable (i'm 6'2", 175 lbs), workmanship is superb, price is not too bad.
I've used an earlier version of this bag for about ten years. I wouldn't buy another, although I like its light weight. If in market, today, I'd definitely consider a quilt of some sort for summer and 3-season use for sake of simplicity and versatility.
For various reasons, I mostly use this bag with bivy sack, so its delicate fabric isn't really the issue. I particularly dislike its very flimsy zipper, but am unfamiliar with current models.
Although it's clearly a very fine product, I suspect some of the other comparable bags available may have superior details. This is apart from bag-versus-quilt question.