I'm getting on really well with my Omnifuel. It sits in my trangia at the moment, stripped down and has some serious poke.
I've put 4l of unleaded through it so far and all it needs is the jet poking with the provided wire on the tool. ...
Doesn't the Omnifuel have a built-in jet cleaner then? Some have 'shaker' cleaners, the one on my Nova is magnetic and there's a little magnet on the supplied tool to activate it.
It can struggle to simmer with this dirty fuel if the jet isn't poked every time though.
As has been said using the cleaning wire can wear the jet but if you're careful it shouldn't cause serious wear for at least a few years, and a jet isn't expensive compared with what you'll save on a few gallons of Coleman Fuel.
Fairly early on I learned that it's important to put these stoves out the correct way. Don't turn the flame down until it goes out, because at the end it will burn with a very small yellow flame. A yellow flame makes soot and soot clogs the jet. It's best to blow it out while it's still burning a blue flame -- you can turn it down to make it easy to blow out, but not so low as to get a yellow flame. Turn off the fuel tap immediately after blowing out the flame, obviously.
[Edit to add] Another point is that when I turn off the Nova I prefer to use the flip-over-bottle method where possible. When the stove cools after turning it off using the tap, the tap can get very tight indeed, to the point where I'm a bit worried about breaking the hinge on the tap lever when I turn it back on. If I turn it off using the tap, while it is cooling I turn it on and off again a couple of times. That stops the tap getting so very tight when it's cold.
I paid £75 for mine off the bay with 3 spare bottles and spares kit.
That was a bargain, good job you saw it first!