The 300mm II is a great lens; probably Canon's best thus far in terms of IQ and resolving power. I also have a 600mm II and only use it when I know my subject will be a known distance and I will be stationary (it is still heavy when you add a beefy monopod and 1Dx to it). So 300mm II + converters are the way to go when walking around and potential subject is an unknown. Also it's just much more versatile; thinking field sports, air shows, even some portrait work.
Here are some shots with the 300mm II + 2x III combo:
Here are some shots with the 300mm II + 2x III combo:
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