DAVID M H.wrote a review of Marmot Arroyo Sleeping Bag: 30 Degree Down on April 12, 2012
First off I am a Marmot nut, but I also have many other peices from bibler, TNF, MTN hardwear, OR, BD equip. and so on.. I have many jackets, shells, gloves and bags from Marmot but thats cause they are the best for their price point. Their down is awsome and their warranty rules, others are great to but I just love Marmot. I have pinnacle bags for my wife and I and pounder bags for high summer and alipne trips. As for the Arroyo, I weighed it on my digital scale(real expensive lab scale, accurate down to a 100th of an ounce), 1lb 15.5 oz for the long RZ with the consumer tags still on. I'll cut those off and prolly loose about 1/2 an ounce or so. After much reading and thinking I went with the Arroyo over the Hydrogen for 2 reasons. Price wasn't a concern, I think the foot box on the Arroyo is better and the durability. Both have about the same weight of down. The 850 in the hydro is just a tad lighter. The real weight savings is in the foot box and they use a lighter fabric. To me the 3 oz. lighter is not worth the loss in durability and down proofness. If your active sleeper,ruff on your gear, or like to bivy in ruff areas go with the Arroyo. Sleep still and are gentle with gear go Hydrogen.
You can't got wrong with this bag for 3 season. Its roomy for a big guy, I'm 6'2" and 220lb. Durable and for me good down to 20's with some light layers on.
Love the Pinnacle to for high alt in the summer(Rainer) and low alt winter trips. Next for me are some Marmot Col's to replace my MTN harwears bags for high winter trips. The 800 series just rocks.