While I was writing the conclusion of the previous log, I came across this barrel that comes in 4 unique colours for some reason, such as light grey or turquoise:

The dimensions are allegedly 500mm on the base, 660mm at the top and 940mm tall. It certainly looks like a more-ideal spread of those litres in terms of fitting components inside, and my opinion is that the light grey does look particularly home-like. Looking at the levels, the light grey is also even more reflective of blue than the blue barrel. 

The obvious drawback is that the clamping ring is even wider, as well as the entire barrel, requiring even more space. It seems that the ring has a more curved shape and doesn't overlap when closed.

The inside for the light grey looks nice. I don't think it would be all that much harder to clean the edges inside. I just wonder if it's as solid as the typical barrels considering there's a £20 price difference. The cost might be because the walls are thinner, or the seal isn't airtight, or perhaps it's simply that they can save on shipping costs because these cone barrels can be stacked.