I've got a Feurhand and a cheap Chinese copy. The Feurhand is far better made - better sealing lid, heavier gauge steel, brighter, feels more solid. I got it from Pelam only 5yrs ago but it is stamped West Germany, so either it was new old stock, or they never changed the wording after reunification.
A hurricane lamp with a reasonable size wick is a lot brighter than a candle, but nowhere near as bright as a pressure lamp (which, as Wayland points out, can be a good thing). Also the hurricane lamp gives a pleasant yellow light, not the searing whiteness of a pressure mantle lamp.
20 hours of light on a tank of maybe 250ml is pretty good. If you have oil central heating then you can run it on standard kerosene as well as bought paraffin.