I chose this soldering iron based on some of the glowing reviews it had, but unfortunately after using this soldering iron several times over the past week, I have to disagree with them.
Firstly the good stuff... I can certainly see the advantage of not being tied to a cord as it allows much more freedom and precision of movement. The ignition worked every time with one click.
The bad stuff... Being gas powered brings with it a couple of pretty big disadvantages. Firstly, the exhaust holes around the tip spew out very hot air that is hot enough to melt the insulation on any wires or components that come near (under 4cm) it. If your fingers happen to be holding something near to it (like, you know, solder) then they frequently feel the wrath of these exhaust ports. Secondly, you have to turn it up very high to get enough heat for soldering jobs, and that means it eats through its full supply of gas in only a few minutes.
Then there's the heat itself, or lack of it. Maybe there was something slightly wrong with mine, as it coughs and splutters about every 10 seconds. It seems to have lots of heat while the tank is more than 3/4 full, but then the heat reduces significantly (you can also hear the gas flow decrease). I found it barely hot enough to melt solder on the maximum setting, and I was frequently having to hold it against components for 10 seconds or more in order for enough heat to be transferred to them for the solder to flow over them, thus damaging the components themselves (e.g. melted LED cases, melted wire insulation, etc). Compared to my 20 year old mains powered soldering iron, the end results were terrible.
Finally it all feels a bit loose. The nip seems to frequently unscrew, no matter how much I tighten it with a spanner. The entire end half of the iron moves ever so slightly, which normally wouldn't bother me, but when trying to solder 0.1" spaced pins on stuff this becomes a very annoying problem.
I'm going to keep it, purely because there are some rare times that not being tied to a mains socket will be invaluable, but I certainly won't be using this as my main soldering iron - back to my trusty 20 year old mains powered one.