In reply to Viejo:
XGK. It's by far the most reliable multifuel stove I've used. A friend of mine use his daily for 8 months when cycling across Africa. Not a single clog. I've used a few other similar models available in the market (Whisperlite International, Dragonfly, Omifuel, Optimus) and none of them handle dirty fuel as good. I prefer stoves without a simmer as it's less prone to clogging and easier to strip. When I need a dim flame I just turn the main valve off and then back on for a second just before it die down. It will produce some soot though.
The MSR pump needs regular (annual) O-rings replacement otherwise leaky O-rings can be very dangerous (don't ask me how I found out!). The very old style XGK pump is prone to cracks near the valve but the new pump is much more robust.
I've had the XGK II for 14 years and the XGK EX for a year. They are very similar but the EX is better in terms of stability and rigidity.
If you want a lighter multifuel stove I'd recommend the Svea 123R. Solid brass construction and self contained wind shield. It has a small self pressurised fuel reservoir and is very compact. It'll take an extra minute to prime but the stove itself is invincible and handles dirty fuel very well. Unfortunately mine was confiscated in an airport when they mistook the shape of the empty reservoir as a gas canister!