I recently bought this stove to replace my 20 year old whisperlite. I love it. The size initially seems large until you realize that your entire kitchen minus the food fits into the included pot. It boils very fast and the design of the pot maximizes the fuel use efficiency. It is very light and packable. I have not yet used it in extreme conditions (I have only used it at sea level in the summer on an ocean kayaking trip) but I look forward to taking it to some harsher conditions.
It is a little pricey but MSR has made an astounding product in this stove.

This is one of the best stoves in my opinion. It is not the lightest but is very reliable. A friend bought one in the late 80's, my dad bought it from the friend, and I took it from my dad. Now, twenty years, dozens of trips and hundreds of nights later it is just begining to have some performance problems. This is a marvelous stove. If you are considering buying it also chech out the whisperlite internationale for it's ability to burn multiple fuels. That can come in very handy.

This stove is excelent for most backpacking (as long as you don't want to cook a major meal). For heating water it works great. I have used mine multiple times in diverse temperatures (0F-100+F) and altitudes (up to about 12,000ft) and have not been disapointed. For the price it is a fantastic water boiler. No complaints. You also can count on MSR quality.

This is a great bag. It stuffs down super small and only takes up a corner of your pack. If you're into minimalist fast and light packing this is a great bag. I give it four stars, not because there's anything wrong with it, but because there's better out there. If you are willing to pay a little extra check out the Golite adrenaline series (0, 20, and 40 degree rated bags). Golite uses 800 fill down as opposed to Lafuma's 650 (Translation: greater loft relative to weight and size). That combined with the Golite's fabric, zipper length and placement, and reinforced head and foot box make it the five star bag.
Bottom line: This bag is good, no, it's great, however if you can squeeze a little more out of the money tree check out the golite adrenaline series.

This purifier is the best ive had. It uses electricity to basically create clorine from salt to put in the water. It works great, is about the size of a mini-maglight, is incredibly light, and even though it uses clorine it doesn't make the water tast bad. The only draw back is that since it is not a filter it does not remove silt from cloudy water. It is great for clear water from rocky streams or lakes. If you want to go fast, light, and compact this is the filter. If you backpack through areas with silty/cloudy water, I suggest the MSR miniworks.