Unfortunately, I will be returning this stove to Backcountry.com. I really like the concept and features of this stove, but the stove that I received was very unstable. I didn't even get a chance to use it once. After receiving it, I unpackaged it, attached it to a fuel canister, and set a pot of water on top of tis. The pot would only make contact with three of the four pot supports making it quite unstable. In addition, the play in the folding mechanism aplified the unstability even more. I contacted Brunton about this and they suggested that I try another one. So, I ordered a second from Backcountry.com and it had the same problems, maybe even a bit worse! Rather than pay to send these stoves to Brunton for repair (they are both BRAND NEW and never even used once), I have decided just to return them both to Backcountry.com and try an Optimus Crux instead (similar stove, only 3 pot supports, different locking mechanism).... Also, this stove is now MADE IN CHINA.

overall Good product i like the way it packs along with ib cook-set makes for more room in pack and stove protection. however after the second us while lighting it flames began to rise up from bottom of flex and top of fuel canister. thankfully i was also carrying a MSR Pocket Rocket so all was good. when i returned i home i cleaned my flex and reattempted lighting and it worked fine however, sadly on my next trip same thing as before happened again but bigger flame haven't used Flex since. However, noticing that the flex in 2007 won the Outside gear of the year award i blame my miss fortune on just one rotten egg in the cart or my own ignorance, whose to say

This stove is very powerful and cranks out a short boil time. It also packs incredibly small and folds out ready to go in seconds. Highly recommend it for isobutane (canister) stoving! 4 stars because of the lack of pot stabilization.

Fantastic product. Does exactly what it's supposed to do. Quick boil, light weight, super small, wide adjustable flame, sturdy wide support. One of the better products in my pack.

I bought the Brunton Flex because it had more and wider pot supports and a tighter spring-loaded sleeve to hold the burner upright. No more burner wobble as has been reported with the Crux. I put a tiny bit of motor oil on the sleeve to keep it from galling and wearing. I want it to stay tight. Motor oil should be unaffected by the heat of the stem when in use.

I was using a slightly (.7 oz.) lighter Vargo Jet-Ti burner but the Crux had better pot supports and a wider flame ring for more even heating.

I like this burner and its great controllability and, if needed, higher heat output with the larger burner ring. Very well re-designed by Brunton and a bit lighter than the Crux,