It is a nice review, though very light in comparison to the excellent reviews at TDP.
I did find this strange:
Who it’s not for: This is definitely not a lens for the weekend warrior to start with. Those considering buying their first long lens would be better off starting with a shorter focal length such as the Canon 300mm f/4 L IS and then “graduating up to the bigger glass.
I would say that anyone thinking of buying a big white should buy the length that best suits their photography at that moment, and in the foreseeable future. It would be extremely costly to start collecting lenses, and if you can afford a 600 then get it, don't get the 300, then the 400, then the 500 unless you are Bill Gates, or possibly a neurosurgeon, or even a neuroanatomist!
Also, isn't there an error in the:
A bit on Image Stabilization (from Justin’s text)
“Optical Image Stabilizer technology makes hand-held photography more practical at slow shutter speeds*” (*Canon USA). IS helps free the camera and photographer from the tripod and gives you a bit more latitude to how and where you shoot. As a guide, it’s suggested that photographers’ shutter speeds should match the apparent focal length of the lens. So ideal shutter speeds on a full frame camera like the 1DX, 5DMKIII, or 6D, would be about 1/300th of a second at 300mm
As this is a review of a 600mm lens, shouldn't it be 1/600th? It looks like someone copy and pasted from a 300 review. But I am often wrong about these things.