I tried a few LW lamps here in Australia and they were all duds - the first one was a 52oz, it flowed for about 2 hours then stopped dead so I returned it and swapped it for 2 20oz's. They'd both overheat in 2 hours flat and sit at the top doing nothing so I gave up on LW lamps - I didn't really like the colours anyway, too gaudy for me...
I have a new found respect for the peace lamps - they can run for ages and they flow ok, better than a LW one anyway (at half the price!) Nothing like a Mathmos of course but for a cheap daily work horse they do a good job.