I have had a few versions of these small jet torches.
The ones that look like little fire extinguisher tanks I have had some problems with.
The attachment of the torch head to the tank depends on small screws and after being in a pocket or pack they are overstressed. They either stripped out or failed in other ways.
I also found problems with the small metal lever inside that operates the gas valve, they bent and wouldn't open the valve enough.
In very cold weather there were problems with pressure.
These jet torch type lighters are more sensitive to fuel pressure than the Bic type lighters are.
Carry them in an inside pocket if it is below freezing out.

Now what I like about them is they provide a hot flame that has a long reach and even works when you aim it down instead of up.
The ones with the small wire in the flame path are almost as windproof as you can get, and even though you should be sheltering your fire from the wind it might matter to some of us sometime.

Edits:

Rodion, if you are asking about how long butane stays good the answer is practically forever. So long as the refill can or the lighter are not leaking they can sit on the shelf for the rest of your life, and then be used to light the memorial candles on your grave.

PS.
Safari's list reminded me of one thing. I had a couple of the ones with hinged lids like the Neo and the Storm lighters. The hinges for the tops on them broke after a while.