I've always fancied one of these, but never bothered getting one, always used gas. Since getting serious about wildcamping and hillwalking I decided to give a Trangia a go and I love it, it's now my main stove.
These are almost indestructible, a beautifully simple design that has lasted. You pour a small amount of meths into the reservoir, screw the top on and stick it in your pocket - they don't leak. When lit, they take a minute to settle down, then act like a gas ring. Cheap, ever lasting, fuel is cheap, functional. For anyone thinking of getting one of these for the first time, do be aware that the Trangia is just a burner, you have to support your pan / kettle on something additional. Generally used with army mug / windproof shield / stand kit, I find these too large and so use my Trangia with a Honey Stove which, combined, makes a brilliant setup comparable with any gas affairs my mates carry. Obviously you can make a stand out of rocks, sticks, small hole in the ground, etc.
Meths is about £2 a bottle and that lasts me about 5 weekends, maybe more.
One tip to try is adding 10% water to your meths, it makes for a hotter, cleaner burn and eliminates soot deposits.
Just running some real life tests as I have never timed things before and a full Trangia just burned for an amazing 36 mins and boiled over half a pint of water (a standard mug) in 4:30 mins on pure meths and 3:50 using 90%/10%, both using the Honey Stove 4 plate configuration with the Trangia on the mid setting.