I've had this bag for 1 year now. It fits all the requirements I was looking for. I'm a hot sleeper and tend to perspire quite a bit. this bag has kept me warm without being clammy down to about 20F. I haven't spent a night lower than that yet but it seems like it could easily preform well at lower temps. It is a bit roomy (I'm 6', 170lbs) and it does lack a draft collar but this suits me fine for my warm sleeping tendencies. Construction is great, no loss in loft yet after a couple of launderings. I've had no problems with stuck zippers (They must have added a stiffener for the zipper before the model year I bought). It's way lighter and less bulky than my 0F hollofill bag.
Zipped together with another 2nd dimension is another story. My girlfriend and I just couldn't get warm and comfortable on a 25F night. to much room to heat up and no way to close the gap around our head and shoulders. (However, I suspect this would be the case with any two bags zipped together no matter what brand). Once we separated the bags I was fine with only my skivies between me and the bag

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Kelty 0 F Hollofill

This a reasonally warm bag with a major flaw that condemns it. On a cold night it may take as long as ten minutes to zip the thing. There is no stiff ener along the zipper so it catches every few inch in the very soft liner. In Glacier Park, backpacking, I would nearly freeze before it would zipped. No neck collar hurt it as well. Its is easily the worst bag I have owned.

Customer Service

Mountain Hardwear customer service was of no help at all. Arrogant, "" we don' make mistakes"" attitude. No help of any kind.

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Norhface SlumberJack

I've had this bag for 3 years and haven't found any problems. It's light, reasonably warm (3 season), and durable as hell. This bag has seen winters in Yellowstone, Yosemite, and Rocky Mt. National park. Great buy.

Customer Service

I've come to own many Mountain Hardwear products over the past four years and now most of my friends have realized the durability and innovation. I love this company.

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Montbell - The Heat The North Face - Minaret The North Face - Cat's Meow

i have had this bag for three years and it is a good bag. I have never had any zipper problems and it has always kept me warm. It has good value for its price. It is good for most seasons and has always kept me warm. I like the moskito ney that stows away right below the opening. It was great when i went up to Canada last summer.

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north face
coleman