You Get What You Pay For
I bought one in May last year and was initially impressed with it, even though the flame would frequently cut out after two minutes, each time it was lit. It would boil water quickly and clearly gave off a lot of power with the Coleman cartridges.
But this year it has failed. It no longer seems to release the gas assuringly and I've read a number of reviews on Amazon from people with identical experiences.
It's a great shame as I really was impressed initially. Maybe I should have sought a replacement sooner but I fail to believe that these are built to last and I'll now be investing in something more expensive.