I purchased the Eta lite plus for half the price of a basic Jet boil or MSR reactor.
The lite+ boils 500 ml of water in about 2minutes 30 sec. The cool thing about this stove is that you can hang it by a string to boil water.( Be careful not to overfill or you could scold your hand) Add an adaptor and cheap gas bottles can be used without worrying about stability.