I have a gas soldering iron and always get my Weller and an extension lead out if there's 240v (or 12v and an inverter) anywhere near where I'm working. That's how convenient they are.

Gas ones are great to have in the toolbox for an emergency but I wouldn't deliberately put myself in a position where I'm relying on one. Temperature control is just impossible.
That iron is probably going to be worth a punt for occasional use on light duties (building little kits from Maplins, making up audio cables, etc.). I like the built-in croc clips to hold the work.
It won't begin to look at anything that can soak up any heat because it's probably a pretty weedy heater (and not temperature controlled). On a decent iron you will have a 50-100 watt element with temperature control so if you are trying to solder something that is conducting heat away it can pump in a bit more heat and melt the solder. So, probably not great for most automotive tasks but for a fiver who cares if it ends up in the bin? As said, I have a coupe of old Wellers from junk sales, mainly. They just go on and on. Can't remember last time I even had to change a bit, and I do a
lot of soldering.
Hot melt glue sticks look a bargain. Need some more of them. The "helping hands" also look good. They are always handy.
Kevin