I've been using a Swedish military Trangia quite a lot lately and it is really very good indeed.
Totally reliable and nothing to go wrong.
Works in high winds. No wonder Trangia call them storm cookers.
Aluminium pail and frypan have good capacity and very easy to clean.
Works very well with an open fire.
Meths is dirt cheap (I get 2 litre containers of colourless 'industrial methylated spirits')
Stable - doesn't get knocked over easily.
Discreet - very little flame and very quiet. And mine is green!
Compact, and you can store stuff inside it. Matches, brew kit, dehydrated grub and you have a self contained cooker/ration pack.
The supplied 300ml bottle gives you a long weekend's independence from civilisation.
The only downsides are 1) it is a bit slower than gas/petrol, but really this is not an issue for me - I like to slow down a bit in the woods. It is very quick to set up and boils 500ml in 6 minutes or so on a cold night.
And 2) It is definitely too heavy at about 1kg, by modern standards. I might choose something lighter if I was doing a lot of ascents and distance - though even then I'd think long and hard about leaving it behind, given its reliability. But for 90% of trips, it is superb.
Possibly the Zebra billy/trangia burner/clickstand/windshield combination is the best combination. Certainly lighter, but probably less bombproof.
The above link do the Swedish military Trangias for £8, but Ironclad do them for £10 delivered (actual post costs are about £4.50). I have seen them sold for £18. Even at that price they are good value for what they are.