The lights are great, but the flicker is a standard AC/50Hz cycle, and massively distracting.
The phrase "As with all low voltage lights some people may see a faint flicker effect from the lights" isn't very accurate; these flicker more than any other low voltage light I own (and I have lots)... It's a design feature due to the blocks being reversible, which most lights don't have/require.
Certainly not the kind of light you'd want to leave on full time. They look great, but definitely only an occasional light.
D. Rimron, Glasgow - 7th January 2013
Firebox says: Hello, the supplier has informed us that they have worked out the kinks on this light and stopped the flickering from happening. But thanks for the honest review its good to know everyones opinion on these lights!