I thought I had finished searching the market for lightweight stoves after I tried the jetboil, but Primus has stood up to the challenge and created an ultra lightweight stove system. I finally got sick of eating dehydrated meals- so I brought the Primus along on my three day trip into the Wind River Range of Wyoming and found that it worked brilliantly. I can go light and eat my pancakes too! The lid doubles as a frying pan. Both the lid and pot are coated with a triple layer non-stick surface that works great and cleans easily. The Primus ETA Express Stove burns at 80% efficiency as opposed to the usual 40-50% which allows me to save weight on fuel which is important when my pack is already full of climbing gear. The other benefit of this stove is that you can put any pot on it- not just the small one that comes with it.
While the ETA Express is a bit lighter than the jetboil, it does not pack as small. Also it does not hang without purchasing a separate hanging kit. It is always nice to be able to keep the stove off the fuel off the snow on those cold nights.

compared this with the jetboil, and went with the primus because I liked the fry-pan lid, and for the included windscreen. Boiled 1 cup of cold water in the morning (reached 36 at night) in a few seconds. I lit the stove on low, put the pot with water on it and turned it to high, and instantly saw little bubbles forming on the bottom of the pot! was at a raging boil 15 or 20 seconds later. I had cooked chili the night before, tried cooking the chilie in the can it came in at first, not wanting to use the included pot which I would have to clean later. It was difficult trying to warm the chili in the can without burning it, so I gave in after remember the pot was non-stick, and poured the chili in and finished warming it that way-- worked great and sped up the process unbelievably. Easy to clean, the titanium non-stick is better than my non-stick fry pan at home!
The stove is great on its own. fully adjustable flame, on high its kind of intimidating. The true genius is the complete system, the coiled metal heat dispersment system on the pot bottom combined with the burner is the best system there is.

This stove is great... just used it on a several day backpacking trip at 12k feet and above and it worked flawlessly!! Temps were lower upper teens to upper 20's and still no problem. Also, very fuel effecient. My buddy had a jetboil and had to use his second canister and he hardly had any control over the flame... my primus could turn way down to a simmer or all the way up to boil water in minutes! Very packable as well! I know some people thought it was loud... but that's only if you turn it on full blast and noise really isn't an issue for as little time as you need to run it.

I have used this stove in the field and it has performed well. Lightweight, easy to pack, set-up, and use. No messes, no fuel spills. Boils quickly. Flame control adjusts from blow torch to slow simmer. Various sized canisters allows scalability to type of activity. Stove is not limited to one type of pot. Skillet/lid is an efficient and functional attribute.

The only downside is the effect cold has on the gas cannisters resulting in slower boil times.

Great little stove for backpacking trips. It's lightweight and boils water very fast. The skillet is just about the right size for a couple eggs and it also works well to flip over and use as a lid. Everything fits right back into the pot which goes into a small mesh sack that holds everything very neatly.