I have a £30 version and it works well. Mates have bought a cheap version from
Cotswolds, and they seemed ok for the (considerably less) price.
The only down side of the cheaper version seemed to be no rubber stand and not having a see through bottom to see the fuel levels. I think it might not have a height adjuster either but I'm not sure on that one now.
On the plus side, they're only £6 so it doesn't hurt so much if you lose it!!!
I can't comment on burn times between the 2 because we never compared them.