We have recently been doing a fair bit of research on combustion heaters.
I rang the local bloke that installs the heaters, he installs them all and I asked him what the best was.
Eureka was his No 1 pick by a fair bit.
Ultimate no 2 pick.
In his opinion the cheapies are not worth owning, the fire boxes just don't last and the baffle plates burn out real quick.
I have not yet decided to go for a Eureka or for the Ultimate. The Eureka is a $hit load more $$
We have an Ultimate built in unit in our current house, we purchased it new about 8 years ago and it has been brilliant.
The new house has 11ft ceilings and is massive so have been tossing up wether it's worth spending the extra coin on a Eureka for such a big old house.