This build is fantastic for countering fast expand openings, useful in a meta where there's lots of gas-rax-CC-Factory builds as you can do crucial damage before any cyclone or hellion emerges. It struggles to stay on par with one-base 2-gas builds, though with good control you can often still transition quite well.
Iaguz talks about the strength of the different openings at the start of this VoD: https://www.youtube.com/watch?v=3M8gW_RJyvM
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